diff --git a/panel.html b/panel.html
index 07988e9..92998cd 100644
--- a/panel.html
+++ b/panel.html
@@ -2,7 +2,7 @@
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
-    <title>Dokument</title>
+    <title data-i18n="panel.windowDocument">Dokument</title>
     <style>
       /* Theme-Variablen — Defaults sind Mocha; applyTheme (themes.ts) überschreibt. */
       :root {
@@ -375,33 +375,33 @@
   <body>
     <div class="panel-topbar" data-tauri-drag-region>
       <div class="panel-tabs" id="panel-tabs">
-        <button class="panel-btn" data-mode="commands" title="Befehls-History">Befehle</button>
+        <button class="panel-btn" data-mode="commands" data-i18n-title="panel.tabCommandsTitle" data-i18n="panel.tabCommands">Befehle</button>
         <span class="tab-sep"></span>
-        <button class="panel-btn" data-mode="draft" title="Dokument">Dokument</button>
-        <button class="panel-btn" data-mode="wiki" title="Archiv-Wiki">Wiki</button>
-        <button class="panel-btn" data-mode="search" title="Suchtreffer">Suche</button>
+        <button class="panel-btn" data-mode="draft" data-i18n-title="panel.tabDraftTitle" data-i18n="panel.tabDraft">Dokument</button>
+        <button class="panel-btn" data-mode="wiki" data-i18n-title="panel.tabWikiTitle" data-i18n="panel.tabWiki">Wiki</button>
+        <button class="panel-btn" data-mode="search" data-i18n-title="panel.tabSearchTitle" data-i18n="panel.tabSearch">Suche</button>
         <span class="tab-sep"></span>
       </div>
-      <button class="winbtn" id="panel-dock" title="Wieder andocken">
+      <button class="winbtn" id="panel-dock" data-i18n-title="panel.dock">
         <svg width="14" height="14" viewBox="0 0 16 16"><rect x="1.5" y="2.5" width="13" height="11" rx="1.5" /><path d="M9.5 2.5v11" /><path d="M4 8h3.4M6 6.2 7.8 8 6 9.8" /></svg>
       </button>
-      <button class="winbtn osctl" id="win-min" aria-label="Minimieren">
+      <button class="winbtn osctl" id="win-min" data-i18n-aria="panel.minimize">
         <svg width="12" height="12" viewBox="0 0 12 12"><line x1="2" y1="6.5" x2="10" y2="6.5" /></svg>
       </button>
-      <button class="winbtn osctl" id="win-max" aria-label="Maximieren">
+      <button class="winbtn osctl" id="win-max" data-i18n-aria="panel.maximize">
         <svg width="12" height="12" viewBox="0 0 12 12" fill="none"><rect x="2.5" y="2.5" width="7" height="7" rx="1" /></svg>
       </button>
-      <button class="winbtn close" id="panel-close" title="Panel schließen">
+      <button class="winbtn close" id="panel-close" data-i18n-title="panel.closePanel">
         <svg width="12" height="12" viewBox="0 0 12 12"><path d="M3 3l6 6M9 3l-6 6" /></svg>
       </button>
     </div>
     <div class="panel-head">
       <div class="panel-titlerow" data-tauri-drag-region>
-        <span class="panel-title">Dokument</span>
-        <button class="panel-btn panel-edit draft-only" id="panel-title-edit" title="Titel bearbeiten">✎</button>
+        <span class="panel-title" data-i18n="panel.tabDraft">Dokument</span>
+        <button class="panel-btn panel-edit draft-only" id="panel-title-edit" data-i18n-title="panel.editTitle">✎</button>
       </div>
       <div class="panel-actions">
-        <select class="panel-lang draft-only" id="panel-lang" title="Sprache der Rechtschreibprüfung">
+        <select class="panel-lang draft-only" id="panel-lang" data-i18n-title="panel.spellcheckLang">
           <option value="de">DE</option>
           <option value="en">EN</option>
           <option value="en-GB">EN-GB</option>
@@ -410,17 +410,17 @@
           <option value="it">IT</option>
           <option value="nl">NL</option>
         </select>
-        <button class="panel-btn draft-only" id="panel-wiki-jump" title="Im Wiki öffnen">
+        <button class="panel-btn draft-only" id="panel-wiki-jump" data-i18n-title="panel.openInWiki">
           <svg width="14" height="14" viewBox="0 0 16 16"><path d="M8 3.5C6.6 2.4 4.6 2 2.5 2v11c2.1 0 4.1.4 5.5 1.5 1.4-1.1 3.4-1.5 5.5-1.5V2c-2.1 0-4.1.4-5.5 1.5z" /><path d="M8 3.5v11" /></svg>
         </button>
-        <button class="panel-btn draft-only" id="panel-mode" title="Rohtext / gerendert">MD</button>
-        <button class="panel-btn draft-only" id="panel-content-edit" title="Entwurf bearbeiten (Cmd/Ctrl+Enter speichert, Esc verwirft)">
+        <button class="panel-btn draft-only" id="panel-mode" data-i18n-title="panel.toggleRaw" data-i18n="panel.rendered">MD</button>
+        <button class="panel-btn draft-only" id="panel-content-edit" data-i18n-title="panel.editDraft">
           <svg width="14" height="14" viewBox="0 0 16 16"><path d="M10.8 2.6 13.4 5.2 6 12.6l-3.1.5.5-3.1z" /><path d="M9.7 3.7 12.3 6.3" /></svg>
         </button>
-        <button class="panel-btn draft-only" id="panel-copy" title="In die Zwischenablage kopieren">
+        <button class="panel-btn draft-only" id="panel-copy" data-i18n-title="panel.copy">
           <svg width="14" height="14" viewBox="0 0 16 16"><rect x="5.5" y="5.5" width="8" height="8" rx="1.5" /><path d="M10.5 3.2V3A1.5 1.5 0 0 0 9 1.5H3A1.5 1.5 0 0 0 1.5 3v6A1.5 1.5 0 0 0 3 10.5h.2" /></svg>
         </button>
-        <button class="panel-btn draft-only" id="panel-archive" title="In den Archiv-Ordner speichern">
+        <button class="panel-btn draft-only" id="panel-archive" data-i18n-title="panel.archive">
           <svg width="14" height="14" viewBox="0 0 16 16"><rect x="1.5" y="2.5" width="13" height="3.5" rx="1" /><path d="M2.8 6v6.5a1 1 0 0 0 1 1h8.4a1 1 0 0 0 1-1V6" /><path d="M6.3 9h3.4" /></svg>
         </button>
       </div>
diff --git a/popup.html b/popup.html
index ea253d6..d9d0323 100644
--- a/popup.html
+++ b/popup.html
@@ -2,7 +2,7 @@
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
-    <title>Projekte</title>
+    <title data-i18n="panel.windowProjects">Projekte</title>
     <style>
       html,
       body {
diff --git a/src/archive-form.ts b/src/archive-form.ts
index e83fd3f..19c934d 100644
--- a/src/archive-form.ts
+++ b/src/archive-form.ts
@@ -3,6 +3,8 @@
 /// archivieren, Escape schließt. Gemeinsam für das angedockte Panel und das
 /// abgelöste Fenster.
 
+import { t } from "./messages";
+
 export interface ArchiveFormMeta {
   folder?: string;
   description?: string;
@@ -23,12 +25,12 @@ export function initArchiveForm(
   const form = document.createElement("div");
   form.className = "archive-form";
   form.hidden = true;
-  const folder = field("Ordner — z. B. konzepte/panel");
-  const desc = field("Beschreibung");
-  const tags = field("Schlagwörter, kommagetrennt");
+  const folder = field(t("archiveForm.folder"));
+  const desc = field(t("archiveForm.description"));
+  const tags = field(t("archiveForm.tags"));
   const submit = document.createElement("button");
   submit.className = "archive-form-submit";
-  submit.textContent = "Archivieren";
+  submit.textContent = t("archiveForm.submit");
   form.append(folder, desc, tags, submit);
   document.body.append(form);
 
diff --git a/src/commands-view.ts b/src/commands-view.ts
index 634130b..d312630 100644
--- a/src/commands-view.ts
+++ b/src/commands-view.ts
@@ -6,6 +6,7 @@
 /// Fremdtext und gehen nie durch innerHTML.
 
 import { writeText } from "@tauri-apps/plugin-clipboard-manager";
+import { storedLocale, t } from "./messages";
 
 
 /// Entfernt Bidi- und Zero-Width-Steuerzeichen (U+200B–200F, U+202A–202E,
@@ -34,10 +35,11 @@ export interface CommandsView {
 
 function fmtTime(ts: number): string {
   const d = new Date(ts * 1000);
-  const hm = d.toLocaleTimeString("de", { hour: "2-digit", minute: "2-digit" });
+  const loc = storedLocale();
+  const hm = d.toLocaleTimeString(loc, { hour: "2-digit", minute: "2-digit" });
   return d.toDateString() === new Date().toDateString()
     ? hm
-    : `${d.toLocaleDateString("de")} ${hm}`;
+    : `${d.toLocaleDateString(loc)} ${hm}`;
 }
 
 /// Kurzes visuelles Feedback (copied/error) — der eine Flash-Helper fürs
@@ -59,7 +61,7 @@ export function panelToast(msg: string) {
 function copyBtn(text: () => string): HTMLButtonElement {
   const btn = document.createElement("button");
   btn.className = "panel-btn cmd-copy";
-  btn.title = "Befehl kopieren";
+  btn.title = t("commands.copyOne");
   btn.innerHTML =
     '<svg width="14" height="14" viewBox="0 0 16 16"><rect x="5.5" y="5.5" width="8" height="8" rx="1.5" /><path d="M10.5 3.2V3A1.5 1.5 0 0 0 9 1.5H3A1.5 1.5 0 0 0 1.5 3v6A1.5 1.5 0 0 0 3 10.5h.2" /></svg>';
   btn.addEventListener("click", async () => {
@@ -72,7 +74,7 @@ function copyBtn(text: () => string): HTMLButtonElement {
 function deleteBtn(onClick: () => void): HTMLButtonElement {
   const btn = document.createElement("button");
   btn.className = "panel-btn cmd-del";
-  btn.title = "Aus der History entfernen";
+  btn.title = t("commands.removeOne");
   btn.innerHTML =
     '<svg width="14" height="14" viewBox="0 0 16 16"><path d="M2.5 4.5h11" /><path d="M5.5 4.5V3a1 1 0 0 1 1-1h3a1 1 0 0 1 1 1v1.5" /><path d="M4 4.5l.7 8.6a1 1 0 0 0 1 .9h4.6a1 1 0 0 0 1-.9l.7-8.6" /></svg>';
   btn.addEventListener("click", onClick);
@@ -96,7 +98,7 @@ export function initCommandsView(
       if (rec.session) {
         const sep = document.createElement("div");
         sep.className = "cmd-sep";
-        sep.textContent = `Session · ${fmtTime(rec.ts)}`;
+        sep.textContent = `${t("commands.session")} · ${fmtTime(rec.ts)}`;
         container.append(sep);
         continue;
       }
@@ -113,7 +115,7 @@ export function initCommandsView(
       if (cmds.length > 1) {
         const all = document.createElement("button");
         all.className = "cmd-all";
-        all.textContent = "Alle kopieren";
+        all.textContent = t("commands.copyAll");
         all.addEventListener("click", async () => {
           await writeText(cmds.map((c) => stripInvisibles(c.cmd)).join("\n"));
           flash(all, "copied");
@@ -166,10 +168,10 @@ export function initCommandsView(
 export type PanelMode = "draft" | "commands" | "search" | "wiki";
 
 const LABEL: { [m in PanelMode]: string } = {
-  draft: "Dokument",
-  commands: "Befehle",
-  search: "Suche",
-  wiki: "Wiki",
+  draft: t("panel.tabDraft"),
+  commands: t("panel.tabCommands"),
+  search: t("panel.tabSearch"),
+  wiki: t("panel.tabWiki"),
 };
 
 /// Vier Tabs Entwurf / Befehle / Suche / Wiki: blenden Entwurfs-Inhalt samt
@@ -202,7 +204,7 @@ export function initPanelMode(opts: {
   function to(m: PanelMode) {
     if (m === mode) return;
     opts.flush();
-    if (mode === "draft") draftTitle = opts.titleEl.textContent || "Dokument";
+    if (mode === "draft") draftTitle = opts.titleEl.textContent || t("panel.tabDraft");
     mode = m;
     apply();
     if (m === "draft") opts.titleEl.textContent = draftTitle;
@@ -211,7 +213,7 @@ export function initPanelMode(opts: {
   /// Auswahl aufheben (Panel zugeklappt) — der nächste to()-Aufruf oder
   /// Tab-Klick wählt wieder aus.
   function clear() {
-    if (mode === "draft") draftTitle = opts.titleEl.textContent || "Dokument";
+    if (mode === "draft") draftTitle = opts.titleEl.textContent || t("panel.tabDraft");
     mode = null;
     for (const t of tabs) t.classList.remove("active");
   }
diff --git a/src/components/Popup.vue b/src/components/Popup.vue
index ab7537b..347de2d 100644
--- a/src/components/Popup.vue
+++ b/src/components/Popup.vue
@@ -83,8 +83,8 @@ onUnmounted(() => {
     </ul>
 
     <footer class="ft">
-      <button class="fbtn" @click="openMain">Öffnen</button>
-      <button class="fbtn danger" @click="quit">Beenden</button>
+      <button class="fbtn" @click="openMain">{{ $t("popup.open") }}</button>
+      <button class="fbtn danger" @click="quit">{{ $t("popup.quit") }}</button>
     </footer>
   </div>
 </template>
diff --git a/src/i18n.ts b/src/i18n.ts
index 4f8a334..787bdd5 100644
--- a/src/i18n.ts
+++ b/src/i18n.ts
@@ -1,320 +1,19 @@
+/// vue-i18n-Wrapper für die Vue-Fenster (index.html). Die Tabellen liegen in
+/// messages.ts und werden von der Terminal-/Panel-Schicht ohne Vue genutzt.
+
 import { createI18n } from "vue-i18n";
 
-const de = {
-  app: {
-    projects: "Projekte",
-    pools: "Pools",
-    usage: "Verbrauch",
-    autostart: "Autostart",
-  },
-  usage: {
-    days7: "7 Tage",
-    days30: "30 Tage",
-    pool: "Pool",
-    project: "Projekt",
-    input: "Input",
-    output: "Output",
-    cacheWrite: "Cache ↑",
-    cacheRead: "Cache ↓",
-    cost: "≈ Kosten",
-    total: "Summe",
-    empty: "Keine Verbrauchsdaten im Zeitraum.",
-    estimateNote:
-      "API-Gegenwert aus den lokalen Transcripts — keine Abrechnung, Historie nur solange claude sie vorhält.",
-  },
-  projects: {
-    project: "Projekt",
-    pool: "Pool",
-    noPool: "– kein Pool –",
-    start: "Starten",
-    stop: "Beenden",
-    terminalSettings: "Terminal-Einstellungen",
-    stillRunning: "{name} läuft noch",
-    poolChangeSaved:
-      "Der Pool-Wechsel ist gespeichert. Die laufende Session arbeitet aber weiter im alten Pool — der neue gilt erst ab dem nächsten Start.",
-    restartHint:
-      "Der Neustart beendet die laufende Session. Der automatische commit+push von claude-sync nach Sessionende entfällt dabei.",
-    keepRunning: "Weiterlaufen lassen",
-    restartNow: "Jetzt neu starten",
-    restarting: "Starte neu …",
-    terminal: "Terminal — {name}",
-    title: "Titel",
-    theme: "Theme",
-    dockIcon: "Dock-Icon",
-    chooseFile: "Datei wählen …",
-    remove: "Entfernen",
-    defaultIcon: "Standard-Icon",
-    appliesNextStart: "Gilt ab dem nächsten Terminal-Start.",
-    cancel: "Abbrechen",
-    save: "Speichern",
-    noPoolAssigned: "kein Pool",
-    needsPool: "Kein Pool zugeordnet",
-    needsKey: "Pool hat keinen API-Key",
-    newProject: "+ Projekt",
-    addFolder: "Projekt importieren …",
-    addFolderTitle: "Bestehenden Ordner als Projekt aufnehmen",
-    addWorkDir: "Ordner hinzufügen …",
-    archive: "Archiv",
-    archiveNone: "kein Archiv — Panel ohne Wiki und Suche",
-    changeDir: "Ändern …",
-    wizardTitle: "Neues Projekt",
-    name: "Name",
-    projectDir: "Projektordner",
-    projectDirCustom: "Ordner wählen …",
-    workDir: "Arbeitsordner",
-    workDirNone: "keiner",
-    workDirCustom: "vorhandenen Ordner verknüpfen",
-    chooseFolder: "Ordner wählen …",
-    create: "Anlegen",
-    wizardHint:
-      "Angelegt werden Projektordner mit memory/, Sentinel-.gitignore, settings.json (Memory-Verzeichnis + Berechtigungen) und die Pool-/Terminal-Zuordnung.",
-    delete: "Projekt löschen",
-    deleteRunning: "Läuft noch — erst beenden",
-    deleteTitle: "{name} löschen",
-    deleteConfirm: "Entfernen",
-    deleteWorkDirs: "Arbeitsordner mitlöschen:",
-    scopeIntegration: "Nur Integration entfernen",
-    scopeIntegrationDesc:
-      "ai-control-Spuren werden entfernt; Projektordner, memory/ und Todoliste bleiben.",
-    scopeArchive: "Integration & Archiv",
-    scopeArchiveDesc: "zusätzlich {path} — endgültig.",
-    scopeFull: "Projekt komplett löschen",
-    scopeFullDesc: "zusätzlich der Projektordner {path} — endgültig.",
-    deletePreviewTitle: "Wird entfernt:",
-    docCount: "kein Dokument | 1 Dokument | {count} Dokumente",
-    artRegistry: "Registry-Eintrag",
-    artAiControl: ".ai-control/ (Config + Icon)",
-    artArchivePerm: "Archiv-Berechtigung in .claude/settings.json",
-    artTodoHook: "Todo-Hook in .claude/settings.json",
-    artPanelFiles: "Panel-Kanaldatei | {count} Panel-Kanaldateien",
-    artDesktop: ".desktop-Starter",
-    artArchive: "Archiv {path}",
-    artProjectDir: "Projektordner {path}",
-    artWorkDir: "Arbeitsordner {path}",
-    todo: "Todoliste",
-    todoDesc: "OFFENE-PUNKTE.md bei jedem Sessionstart einspielen",
-    archiveChangeTitle: "Archiv wechseln",
-    archiveChangeText: "Das Archiv wechselt von {old} nach {neu}.",
-    archiveMigrate: "Dokumente ins neue Archiv verschieben",
-    archiveMigrateHint:
-      "Ohne Haken bleibt das bisherige Archiv unverändert liegen; die App verweist künftig nur noch auf das neue.",
-    archiveChangeConfirm: "Wechseln",
-    groupAppearance: "Darstellung",
-    groupFolders: "Ordner",
-    groupSession: "Session",
-    writesImmediately: "Änderungen hier schreiben sofort — ohne Speichern.",
-  },
-  pools: {
-    pool: "Pool",
-    type: "Typ",
-    actions: "Aktionen",
-    newOauth: "+ oAuth",
-    newApikey: "+ apiKey",
-    relogin: "Zurücksetzen",
-    rename: "Umbenennen",
-    renameTitle: "{name} umbenennen",
-    changeKey: "Key ändern",
-    insertKey: "Key eintragen",
-    delete: "Löschen",
-    assigned: "kein Projekt | 1 Projekt | {count} Projekte",
-    empty: "Noch keine Pools angelegt.",
-    newOauthPool: "Neuen oAuth-Pool anlegen",
-    newApikeyPool: "Neuen API-Key-Pool anlegen",
-    editKey: "API-Key ändern – {name}",
-    name: "Name",
-    apiKey: "API-Key",
-    oauthHint:
-      "Der Pool wird angelegt; die Anmeldung macht claude beim ersten Start selbst per /login (Browser gegen dein Abo).",
-    cancel: "Abbrechen",
-    createPool: "Anlegen",
-    reset: "Zurücksetzen",
-    save: "Speichern",
-    deletePool: "Pool löschen",
-    deleteWarning:
-      "Pool {name} und seine Credential-Datei werden gelöscht. Das lässt sich nicht rückgängig machen.",
-    deleteUnassigns: "Diese Projekte verlieren ihre Pool-Zuordnung:",
-    deleteBlockedTooltip:
-      "Löschen gesperrt — {projects} läuft gerade. Erst beenden.",
-    reloginTitle: "{name} zurücksetzen",
-    reloginWarning:
-      "Der im Schlüsselbund gespeicherte Zugriffstoken von {name} wird gelöscht. Beim nächsten Start verlangt claude erneut /login.",
-    reloginNoEntry:
-      "Kein Schlüsselbund-Eintrag vorhanden — beim nächsten Start meldet sich claude ohnehin per /login an.",
-    reloginBlocked:
-      "Zurücksetzen ist nur bei ungenutztem Pool möglich. Diese Projekte laufen noch:",
-    keychainUnavailableTitle: "Keine sichere Ablage",
-    keychainUnavailable:
-      "Keychain/Keyring ist nicht verfügbar. Der Key kann stattdessen ungesichert als Datei im Pool-Ordner liegen (0600).",
-    storeAsFile: "Als Datei ablegen",
-  },
-};
-
-const en: typeof de = {
-  app: {
-    projects: "Projects",
-    pools: "Pools",
-    usage: "Usage",
-    autostart: "Autostart",
-  },
-  usage: {
-    days7: "7 days",
-    days30: "30 days",
-    pool: "Pool",
-    project: "Project",
-    input: "Input",
-    output: "Output",
-    cacheWrite: "Cache ↑",
-    cacheRead: "Cache ↓",
-    cost: "≈ cost",
-    total: "Total",
-    empty: "No usage data in this period.",
-    estimateNote:
-      "API equivalent from local transcripts — not a bill; history only as long as claude keeps it.",
-  },
-  projects: {
-    project: "Project",
-    pool: "Pool",
-    noPool: "– no pool –",
-    start: "Start",
-    stop: "Stop",
-    terminalSettings: "Terminal settings",
-    stillRunning: "{name} is still running",
-    poolChangeSaved:
-      "The pool change is saved. The running session keeps working in the old pool — the new one applies from the next start.",
-    restartHint:
-      "Restarting ends the running session. The automatic commit+push by claude-sync after the session is skipped.",
-    keepRunning: "Keep running",
-    restartNow: "Restart now",
-    restarting: "Restarting …",
-    terminal: "Terminal — {name}",
-    title: "Title",
-    theme: "Theme",
-    dockIcon: "Dock icon",
-    chooseFile: "Choose file …",
-    remove: "Remove",
-    defaultIcon: "Default icon",
-    appliesNextStart: "Applies from the next terminal start.",
-    cancel: "Cancel",
-    save: "Save",
-    noPoolAssigned: "no pool",
-    needsPool: "No pool assigned",
-    needsKey: "Pool has no API key",
-    newProject: "+ Project",
-    addFolder: "Import project …",
-    addFolderTitle: "Add an existing folder as a project",
-    addWorkDir: "Add folder …",
-    archive: "Archive",
-    archiveNone: "no archive — panel without wiki and search",
-    changeDir: "Change …",
-    wizardTitle: "New project",
-    name: "Name",
-    projectDir: "Project folder",
-    projectDirCustom: "Choose folder …",
-    workDir: "Working folder",
-    workDirNone: "none",
-    workDirCustom: "link existing folder",
-    chooseFolder: "Choose folder …",
-    create: "Create",
-    wizardHint:
-      "Creates the project folder with memory/, sentinel .gitignore, settings.json (memory dir + permissions), and the pool/terminal assignment.",
-    delete: "Delete project",
-    deleteRunning: "Still running — stop it first",
-    deleteTitle: "Delete {name}",
-    deleteConfirm: "Remove",
-    deleteWorkDirs: "Also delete working folders:",
-    scopeIntegration: "Remove integration only",
-    scopeIntegrationDesc:
-      "ai-control traces are removed; project folder, memory/ and todo list stay.",
-    scopeArchive: "Integration & archive",
-    scopeArchiveDesc: "additionally {path} — permanent.",
-    scopeFull: "Delete project completely",
-    scopeFullDesc: "additionally the project folder {path} — permanent.",
-    deletePreviewTitle: "Will be removed:",
-    docCount: "no documents | 1 document | {count} documents",
-    artRegistry: "registry entry",
-    artAiControl: ".ai-control/ (config + icon)",
-    artArchivePerm: "archive permission in .claude/settings.json",
-    artTodoHook: "todo hook in .claude/settings.json",
-    artPanelFiles: "panel channel file | {count} panel channel files",
-    artDesktop: ".desktop launcher",
-    artArchive: "archive {path}",
-    artProjectDir: "project folder {path}",
-    artWorkDir: "working folder {path}",
-    todo: "Todo list",
-    todoDesc: "Inject OFFENE-PUNKTE.md at every session start",
-    archiveChangeTitle: "Change archive",
-    archiveChangeText: "The archive changes from {old} to {neu}.",
-    archiveMigrate: "Move documents to the new archive",
-    archiveMigrateHint:
-      "Unchecked, the previous archive stays untouched; the app just points to the new one.",
-    archiveChangeConfirm: "Change",
-    groupAppearance: "Appearance",
-    groupFolders: "Folders",
-    groupSession: "Session",
-    writesImmediately: "Changes here are written immediately — no save step.",
-  },
-  pools: {
-    pool: "Pool",
-    type: "Type",
-    actions: "Actions",
-    newOauth: "+ oAuth",
-    newApikey: "+ apiKey",
-    relogin: "Reset",
-    rename: "Rename",
-    renameTitle: "Rename {name}",
-    changeKey: "Change key",
-    insertKey: "Insert key",
-    delete: "Delete",
-    assigned: "no projects | 1 project | {count} projects",
-    empty: "No pools yet.",
-    newOauthPool: "Create oAuth pool",
-    newApikeyPool: "Create API key pool",
-    editKey: "Change API key – {name}",
-    name: "Name",
-    apiKey: "API key",
-    oauthHint:
-      "The pool is created; claude signs in itself on first start via /login (browser against your subscription).",
-    cancel: "Cancel",
-    createPool: "Create",
-    reset: "Reset",
-    save: "Save",
-    deletePool: "Delete pool",
-    deleteWarning:
-      "Pool {name} and its credential file will be deleted. This cannot be undone.",
-    deleteUnassigns: "These projects lose their pool assignment:",
-    deleteBlockedTooltip:
-      "Deletion blocked — active: {projects}. Stop the session first.",
-    reloginTitle: "Reset {name}",
-    reloginWarning:
-      "The access token for {name} stored in the keychain will be deleted. On the next start claude asks for /login again.",
-    reloginNoEntry:
-      "No keychain entry present — claude signs in via /login on the next start anyway.",
-    reloginBlocked:
-      "Resetting requires an unused pool. These projects are still running:",
-    keychainUnavailableTitle: "No secure storage",
-    keychainUnavailable:
-      "Keychain/keyring is unavailable. The key can instead be stored unprotected as a file in the pool folder (0600).",
-    storeAsFile: "Store as file",
-  },
-};
-
-const stored = localStorage.getItem("lang");
-const initial =
-  stored === "de" || stored === "en"
-    ? stored
-    : navigator.language.startsWith("de")
-      ? "de"
-      : "en";
+import { messages, storedLocale, type Locale } from "./messages";
 
 export const i18n = createI18n({
   legacy: false,
   globalInjection: true,
-  locale: initial,
+  locale: storedLocale(),
   fallbackLocale: "en",
-  messages: { de, en },
+  messages,
 });
 
-export function setLocale(lang: "de" | "en") {
+export function setLocale(lang: Locale) {
   i18n.global.locale.value = lang;
   localStorage.setItem("lang", lang);
 }
diff --git a/src/messages.test.ts b/src/messages.test.ts
new file mode 100644
index 0000000..bbf074f
--- /dev/null
+++ b/src/messages.test.ts
@@ -0,0 +1,123 @@
+// Übersetzungstabellen und der Vue-freie t()/applyI18n()-Helfer.
+import { afterEach, describe, expect, it } from "vitest";
+
+import { applyI18n, messages, storedLocale, t } from "./messages";
+
+/// Alle Punkt-Pfade eines Nachrichtenbaums, für den Vollständigkeitsabgleich.
+function keys(obj: object, prefix = ""): string[] {
+  return Object.entries(obj).flatMap(([k, v]) =>
+    typeof v === "object" && v !== null
+      ? keys(v, `${prefix}${k}.`)
+      : [`${prefix}${k}`],
+  );
+}
+
+afterEach(() => {
+  try {
+    window.localStorage.removeItem("lang");
+  } catch {
+    /* Storage in der Testumgebung nicht verfügbar */
+  }
+  document.body.textContent = "";
+});
+
+describe("Nachrichtentabellen", () => {
+  it("führen dieselben Schlüssel in beiden Sprachen", () => {
+    expect(keys(messages.en).sort()).toEqual(keys(messages.de).sort());
+  });
+
+  it("lassen keinen Text unübersetzt stehen", () => {
+    // Gleiche Texte sind fast immer eine vergessene Übersetzung. Erlaubt sind
+    // nur Eigennamen und Zeichen ohne Sprache.
+    const erlaubt = new Set([
+      "Pool",
+      "Pools",
+      "Name",
+      "Theme",
+      "Wiki",
+      "MD",
+      "Autostart",
+      "Input",
+      "Output",
+      "Session",
+      "Cache ↑",
+      "Cache ↓",
+      "+ oAuth",
+      "+ apiKey",
+      "Terminal",
+      "Terminal — {name}",
+      ".desktop-Starter",
+      ".ai-control/ (Config + Icon)",
+      "Archiv-Berechtigung in .claude/settings.json",
+      "Todo-Hook in .claude/settings.json",
+      "OFFENE-PUNKTE.md bei jedem Sessionstart einspielen",
+    ]);
+    const gleich = keys(messages.de).filter((k) => {
+      const de = pick(messages.de, k);
+      return de === pick(messages.en, k) && !erlaubt.has(de);
+    });
+    expect(gleich).toEqual([]);
+  });
+});
+
+function pick(obj: object, key: string): string {
+  return key
+    .split(".")
+    .reduce<never>((o, part) => (o as Record<string, never>)[part], obj as never);
+}
+
+describe("t()", () => {
+  it("löst Punkt-Pfade auf", () => {
+    expect(t("panel.tabDraft")).toBe("Dokument");
+  });
+
+  it("setzt Platzhalter ein", () => {
+    expect(t("search.noHits", { scope: "„x“" })).toBe("Keine Treffer für „x“");
+  });
+
+  it("lässt unbekannte Platzhalter stehen", () => {
+    expect(t("wiki.emptyTag", { falsch: "x" })).toBe("Keine Dokumente mit #{tag}.");
+  });
+
+  it("gibt bei fehlendem Schlüssel den Pfad zurück", () => {
+    expect(t("panel.gibtEsNicht")).toBe("panel.gibtEsNicht");
+    expect(t("nichts.da.tief")).toBe("nichts.da.tief");
+  });
+
+  it("folgt der gespeicherten Sprache", () => {
+    window.localStorage.setItem("lang", "en");
+    expect(storedLocale()).toBe("en");
+    expect(t("panel.tabDraft")).toBe("Document");
+  });
+
+  it("fällt bei unbekannter Sprache auf die Browsersprache zurück", () => {
+    window.localStorage.setItem("lang", "kli");
+    expect(storedLocale()).toBe("de"); // test-setup.ts pinnt navigator.language
+  });
+});
+
+describe("applyI18n()", () => {
+  it("beschriftet Text und Attribute", () => {
+    document.body.innerHTML = `
+      <button data-i18n="panel.tabWiki" data-i18n-title="panel.tabWikiTitle">alt</button>
+      <button data-i18n-aria="panel.close"></button>
+      <input data-i18n-placeholder="search.placeholder" />`;
+    applyI18n();
+    const btn = document.querySelector("button")!;
+    expect(btn.textContent).toBe("Wiki");
+    expect(btn.title).toBe("Archiv-Wiki");
+    expect(document.querySelectorAll("button")[1].getAttribute("aria-label")).toBe(
+      "Schließen",
+    );
+    expect(document.querySelector("input")!.placeholder).toBe(
+      "Archiv durchsuchen — #tag filtert",
+    );
+    expect(document.documentElement.lang).toBe("de");
+  });
+
+  it("lässt Markup ohne Marker unangetastet", () => {
+    document.body.innerHTML = `<span>unberührt</span>`;
+    applyI18n();
+    expect(document.querySelector("span")!.textContent).toBe("unberührt");
+  });
+});
diff --git a/src/messages.ts b/src/messages.ts
new file mode 100644
index 0000000..fb43eb6
--- /dev/null
+++ b/src/messages.ts
@@ -0,0 +1,498 @@
+/// Übersetzungstabellen für alle Fenster plus ein Vue-freier `t()`-Helfer.
+/// Die Vue-Fenster (index.html) ziehen die Tabellen über i18n.ts in vue-i18n;
+/// Terminal-, Panel- und Popup-Fenster haben kein Vue und nutzen `t()` und
+/// `applyI18n()` direkt — sonst landete vue-i18n samt Vue in ihren Bundles.
+
+export type Locale = "de" | "en";
+
+const de = {
+  app: {
+    projects: "Projekte",
+    pools: "Pools",
+    usage: "Verbrauch",
+    autostart: "Autostart",
+  },
+  usage: {
+    days7: "7 Tage",
+    days30: "30 Tage",
+    pool: "Pool",
+    project: "Projekt",
+    input: "Input",
+    output: "Output",
+    cacheWrite: "Cache ↑",
+    cacheRead: "Cache ↓",
+    cost: "≈ Kosten",
+    total: "Summe",
+    empty: "Keine Verbrauchsdaten im Zeitraum.",
+    estimateNote:
+      "API-Gegenwert aus den lokalen Transcripts — keine Abrechnung, Historie nur solange claude sie vorhält.",
+  },
+  projects: {
+    project: "Projekt",
+    pool: "Pool",
+    noPool: "– kein Pool –",
+    start: "Starten",
+    stop: "Beenden",
+    terminalSettings: "Terminal-Einstellungen",
+    stillRunning: "{name} läuft noch",
+    poolChangeSaved:
+      "Der Pool-Wechsel ist gespeichert. Die laufende Session arbeitet aber weiter im alten Pool — der neue gilt erst ab dem nächsten Start.",
+    restartHint:
+      "Der Neustart beendet die laufende Session. Der automatische commit+push von claude-sync nach Sessionende entfällt dabei.",
+    keepRunning: "Weiterlaufen lassen",
+    restartNow: "Jetzt neu starten",
+    restarting: "Starte neu …",
+    terminal: "Terminal — {name}",
+    title: "Titel",
+    theme: "Theme",
+    dockIcon: "Dock-Icon",
+    chooseFile: "Datei wählen …",
+    remove: "Entfernen",
+    defaultIcon: "Standard-Icon",
+    appliesNextStart: "Gilt ab dem nächsten Terminal-Start.",
+    cancel: "Abbrechen",
+    save: "Speichern",
+    noPoolAssigned: "kein Pool",
+    needsPool: "Kein Pool zugeordnet",
+    needsKey: "Pool hat keinen API-Key",
+    newProject: "+ Projekt",
+    addFolder: "Projekt importieren …",
+    addFolderTitle: "Bestehenden Ordner als Projekt aufnehmen",
+    addWorkDir: "Ordner hinzufügen …",
+    archive: "Archiv",
+    archiveNone: "kein Archiv — Panel ohne Wiki und Suche",
+    changeDir: "Ändern …",
+    wizardTitle: "Neues Projekt",
+    name: "Name",
+    projectDir: "Projektordner",
+    projectDirCustom: "Ordner wählen …",
+    workDir: "Arbeitsordner",
+    workDirNone: "keiner",
+    workDirCustom: "vorhandenen Ordner verknüpfen",
+    chooseFolder: "Ordner wählen …",
+    create: "Anlegen",
+    wizardHint:
+      "Angelegt werden Projektordner mit memory/, Sentinel-.gitignore, settings.json (Memory-Verzeichnis + Berechtigungen) und die Pool-/Terminal-Zuordnung.",
+    delete: "Projekt löschen",
+    deleteRunning: "Läuft noch — erst beenden",
+    deleteTitle: "{name} löschen",
+    deleteConfirm: "Entfernen",
+    deleteWorkDirs: "Arbeitsordner mitlöschen:",
+    scopeIntegration: "Nur Integration entfernen",
+    scopeIntegrationDesc:
+      "ai-control-Spuren werden entfernt; Projektordner, memory/ und Todoliste bleiben.",
+    scopeArchive: "Integration & Archiv",
+    scopeArchiveDesc: "zusätzlich {path} — endgültig.",
+    scopeFull: "Projekt komplett löschen",
+    scopeFullDesc: "zusätzlich der Projektordner {path} — endgültig.",
+    deletePreviewTitle: "Wird entfernt:",
+    docCount: "kein Dokument | 1 Dokument | {count} Dokumente",
+    artRegistry: "Registry-Eintrag",
+    artAiControl: ".ai-control/ (Config + Icon)",
+    artArchivePerm: "Archiv-Berechtigung in .claude/settings.json",
+    artTodoHook: "Todo-Hook in .claude/settings.json",
+    artPanelFiles: "Panel-Kanaldatei | {count} Panel-Kanaldateien",
+    artDesktop: ".desktop-Starter",
+    artArchive: "Archiv {path}",
+    artProjectDir: "Projektordner {path}",
+    artWorkDir: "Arbeitsordner {path}",
+    todo: "Todoliste",
+    todoDesc: "OFFENE-PUNKTE.md bei jedem Sessionstart einspielen",
+    archiveChangeTitle: "Archiv wechseln",
+    archiveChangeText: "Das Archiv wechselt von {old} nach {neu}.",
+    archiveMigrate: "Dokumente ins neue Archiv verschieben",
+    archiveMigrateHint:
+      "Ohne Haken bleibt das bisherige Archiv unverändert liegen; die App verweist künftig nur noch auf das neue.",
+    archiveChangeConfirm: "Wechseln",
+    groupAppearance: "Darstellung",
+    groupFolders: "Ordner",
+    groupSession: "Session",
+    writesImmediately: "Änderungen hier schreiben sofort — ohne Speichern.",
+  },
+  pools: {
+    pool: "Pool",
+    type: "Typ",
+    actions: "Aktionen",
+    newOauth: "+ oAuth",
+    newApikey: "+ apiKey",
+    relogin: "Zurücksetzen",
+    rename: "Umbenennen",
+    renameTitle: "{name} umbenennen",
+    changeKey: "Key ändern",
+    insertKey: "Key eintragen",
+    delete: "Löschen",
+    assigned: "kein Projekt | 1 Projekt | {count} Projekte",
+    empty: "Noch keine Pools angelegt.",
+    newOauthPool: "Neuen oAuth-Pool anlegen",
+    newApikeyPool: "Neuen API-Key-Pool anlegen",
+    editKey: "API-Key ändern – {name}",
+    name: "Name",
+    apiKey: "API-Key",
+    oauthHint:
+      "Der Pool wird angelegt; die Anmeldung macht claude beim ersten Start selbst per /login (Browser gegen dein Abo).",
+    cancel: "Abbrechen",
+    createPool: "Anlegen",
+    reset: "Zurücksetzen",
+    save: "Speichern",
+    deletePool: "Pool löschen",
+    deleteWarning:
+      "Pool {name} und seine Credential-Datei werden gelöscht. Das lässt sich nicht rückgängig machen.",
+    deleteUnassigns: "Diese Projekte verlieren ihre Pool-Zuordnung:",
+    deleteBlockedTooltip:
+      "Löschen gesperrt — {projects} läuft gerade. Erst beenden.",
+    reloginTitle: "{name} zurücksetzen",
+    reloginWarning:
+      "Der im Schlüsselbund gespeicherte Zugriffstoken von {name} wird gelöscht. Beim nächsten Start verlangt claude erneut /login.",
+    reloginNoEntry:
+      "Kein Schlüsselbund-Eintrag vorhanden — beim nächsten Start meldet sich claude ohnehin per /login an.",
+    reloginBlocked:
+      "Zurücksetzen ist nur bei ungenutztem Pool möglich. Diese Projekte laufen noch:",
+    keychainUnavailableTitle: "Keine sichere Ablage",
+    keychainUnavailable:
+      "Keychain/Keyring ist nicht verfügbar. Der Key kann stattdessen ungesichert als Datei im Pool-Ordner liegen (0600).",
+    storeAsFile: "Als Datei ablegen",
+  },
+  panel: {
+    windowTerminal: "Terminal",
+    windowDocument: "Dokument",
+    windowProjects: "Projekte",
+    tabCommands: "Befehle",
+    tabCommandsTitle: "Befehls-History",
+    tabDraft: "Dokument",
+    tabDraftTitle: "Dokument",
+    tabWiki: "Wiki",
+    tabWikiTitle: "Archiv-Wiki",
+    tabSearch: "Suche",
+    tabSearchTitle: "Suchtreffer",
+    minimize: "Minimieren",
+    maximize: "Maximieren",
+    close: "Schließen",
+    closePanel: "Panel schließen",
+    hidePanel: "Panel ausblenden",
+    detach: "In eigenes Fenster ablösen",
+    dock: "Wieder andocken",
+    editTitle: "Titel bearbeiten",
+    spellcheckLang: "Sprache der Rechtschreibprüfung",
+    openInWiki: "Im Wiki öffnen",
+    toggleRaw: "Rohtext / gerendert",
+    rendered: "MD",
+    raw: "Roh",
+    editDraft: "Entwurf bearbeiten (Cmd/Ctrl+Enter speichert, Esc verwirft)",
+    copy: "In die Zwischenablage kopieren",
+    archive: "In den Archiv-Ordner speichern",
+    chooseArchiveDir: "Archiv-Ordner wählen",
+    processEnded: "[Prozess beendet]",
+  },
+  popup: {
+    open: "Öffnen",
+    quit: "Beenden",
+  },
+  commands: {
+    copyOne: "Befehl kopieren",
+    removeOne: "Aus der History entfernen",
+    copyAll: "Alle kopieren",
+    session: "Session",
+  },
+  archiveForm: {
+    folder: "Ordner — z. B. konzepte/panel",
+    description: "Beschreibung",
+    tags: "Schlagwörter, kommagetrennt",
+    submit: "Archivieren",
+  },
+  search: {
+    placeholder: "Archiv durchsuchen — #tag filtert",
+    minChars: "Mindestens 3 Zeichen — oder Enter.",
+    hits: "{count} Treffer {scope}",
+    noHits: "Keine Treffer für {scope}",
+  },
+  wiki: {
+    archive: "Archiv",
+    docOne: "{count} Dokument",
+    docMany: "{count} Dokumente",
+    all: "Alle",
+    backlinks: "Verweise hierher",
+    backlinksLabel: "Verweise hierher: ",
+    emptyTag: "Keine Dokumente mit #{tag}.",
+    emptyArchive: "Das Archiv ist leer.",
+    emptyHint:
+      "Archivieren: Archiv-Button im Entwurf oder „archiviere das“ im Chat — mit Ordner, Beschreibung und Schlagwörtern.",
+    recent: "Zuletzt",
+    root: "Wurzel",
+    back: "‹ Archiv",
+    noPage: "Keine Wiki-Seite geladen.",
+    openOverview: "Archiv-Übersicht öffnen",
+  },
+};
+
+const en: typeof de = {
+  app: {
+    projects: "Projects",
+    pools: "Pools",
+    usage: "Usage",
+    autostart: "Autostart",
+  },
+  usage: {
+    days7: "7 days",
+    days30: "30 days",
+    pool: "Pool",
+    project: "Project",
+    input: "Input",
+    output: "Output",
+    cacheWrite: "Cache ↑",
+    cacheRead: "Cache ↓",
+    cost: "≈ cost",
+    total: "Total",
+    empty: "No usage data in this period.",
+    estimateNote:
+      "API equivalent from local transcripts — not a bill; history only as long as claude keeps it.",
+  },
+  projects: {
+    project: "Project",
+    pool: "Pool",
+    noPool: "– no pool –",
+    start: "Start",
+    stop: "Stop",
+    terminalSettings: "Terminal settings",
+    stillRunning: "{name} is still running",
+    poolChangeSaved:
+      "The pool change is saved. The running session keeps working in the old pool — the new one applies from the next start.",
+    restartHint:
+      "Restarting ends the running session. The automatic commit+push by claude-sync after the session is skipped.",
+    keepRunning: "Keep running",
+    restartNow: "Restart now",
+    restarting: "Restarting …",
+    terminal: "Terminal — {name}",
+    title: "Title",
+    theme: "Theme",
+    dockIcon: "Dock icon",
+    chooseFile: "Choose file …",
+    remove: "Remove",
+    defaultIcon: "Default icon",
+    appliesNextStart: "Applies from the next terminal start.",
+    cancel: "Cancel",
+    save: "Save",
+    noPoolAssigned: "no pool",
+    needsPool: "No pool assigned",
+    needsKey: "Pool has no API key",
+    newProject: "+ Project",
+    addFolder: "Import project …",
+    addFolderTitle: "Add an existing folder as a project",
+    addWorkDir: "Add folder …",
+    archive: "Archive",
+    archiveNone: "no archive — panel without wiki and search",
+    changeDir: "Change …",
+    wizardTitle: "New project",
+    name: "Name",
+    projectDir: "Project folder",
+    projectDirCustom: "Choose folder …",
+    workDir: "Working folder",
+    workDirNone: "none",
+    workDirCustom: "link existing folder",
+    chooseFolder: "Choose folder …",
+    create: "Create",
+    wizardHint:
+      "Creates the project folder with memory/, sentinel .gitignore, settings.json (memory dir + permissions), and the pool/terminal assignment.",
+    delete: "Delete project",
+    deleteRunning: "Still running — stop it first",
+    deleteTitle: "Delete {name}",
+    deleteConfirm: "Remove",
+    deleteWorkDirs: "Also delete working folders:",
+    scopeIntegration: "Remove integration only",
+    scopeIntegrationDesc:
+      "ai-control traces are removed; project folder, memory/ and todo list stay.",
+    scopeArchive: "Integration & archive",
+    scopeArchiveDesc: "additionally {path} — permanent.",
+    scopeFull: "Delete project completely",
+    scopeFullDesc: "additionally the project folder {path} — permanent.",
+    deletePreviewTitle: "Will be removed:",
+    docCount: "no documents | 1 document | {count} documents",
+    artRegistry: "registry entry",
+    artAiControl: ".ai-control/ (config + icon)",
+    artArchivePerm: "archive permission in .claude/settings.json",
+    artTodoHook: "todo hook in .claude/settings.json",
+    artPanelFiles: "panel channel file | {count} panel channel files",
+    artDesktop: ".desktop launcher",
+    artArchive: "archive {path}",
+    artProjectDir: "project folder {path}",
+    artWorkDir: "working folder {path}",
+    todo: "Todo list",
+    todoDesc: "Inject OFFENE-PUNKTE.md at every session start",
+    archiveChangeTitle: "Change archive",
+    archiveChangeText: "The archive changes from {old} to {neu}.",
+    archiveMigrate: "Move documents to the new archive",
+    archiveMigrateHint:
+      "Unchecked, the previous archive stays untouched; the app just points to the new one.",
+    archiveChangeConfirm: "Change",
+    groupAppearance: "Appearance",
+    groupFolders: "Folders",
+    groupSession: "Session",
+    writesImmediately: "Changes here are written immediately — no save step.",
+  },
+  pools: {
+    pool: "Pool",
+    type: "Type",
+    actions: "Actions",
+    newOauth: "+ oAuth",
+    newApikey: "+ apiKey",
+    relogin: "Reset",
+    rename: "Rename",
+    renameTitle: "Rename {name}",
+    changeKey: "Change key",
+    insertKey: "Insert key",
+    delete: "Delete",
+    assigned: "no projects | 1 project | {count} projects",
+    empty: "No pools yet.",
+    newOauthPool: "Create oAuth pool",
+    newApikeyPool: "Create API key pool",
+    editKey: "Change API key – {name}",
+    name: "Name",
+    apiKey: "API key",
+    oauthHint:
+      "The pool is created; claude signs in itself on first start via /login (browser against your subscription).",
+    cancel: "Cancel",
+    createPool: "Create",
+    reset: "Reset",
+    save: "Save",
+    deletePool: "Delete pool",
+    deleteWarning:
+      "Pool {name} and its credential file will be deleted. This cannot be undone.",
+    deleteUnassigns: "These projects lose their pool assignment:",
+    deleteBlockedTooltip:
+      "Deletion blocked — active: {projects}. Stop the session first.",
+    reloginTitle: "Reset {name}",
+    reloginWarning:
+      "The access token for {name} stored in the keychain will be deleted. On the next start claude asks for /login again.",
+    reloginNoEntry:
+      "No keychain entry present — claude signs in via /login on the next start anyway.",
+    reloginBlocked:
+      "Resetting requires an unused pool. These projects are still running:",
+    keychainUnavailableTitle: "No secure storage",
+    keychainUnavailable:
+      "Keychain/keyring is unavailable. The key can instead be stored unprotected as a file in the pool folder (0600).",
+    storeAsFile: "Store as file",
+  },
+  panel: {
+    windowTerminal: "Terminal",
+    windowDocument: "Document",
+    windowProjects: "Projects",
+    tabCommands: "Commands",
+    tabCommandsTitle: "Command history",
+    tabDraft: "Document",
+    tabDraftTitle: "Document",
+    tabWiki: "Wiki",
+    tabWikiTitle: "Archive wiki",
+    tabSearch: "Search",
+    tabSearchTitle: "Search hits",
+    minimize: "Minimize",
+    maximize: "Maximize",
+    close: "Close",
+    closePanel: "Close panel",
+    hidePanel: "Hide panel",
+    detach: "Detach into its own window",
+    dock: "Dock again",
+    editTitle: "Edit title",
+    spellcheckLang: "Spell-check language",
+    openInWiki: "Open in wiki",
+    toggleRaw: "Raw text / rendered",
+    rendered: "MD",
+    raw: "Raw",
+    editDraft: "Edit draft (Cmd/Ctrl+Enter saves, Esc discards)",
+    copy: "Copy to clipboard",
+    archive: "Save to the archive folder",
+    chooseArchiveDir: "Choose archive folder",
+    processEnded: "[process ended]",
+  },
+  popup: {
+    open: "Open",
+    quit: "Quit",
+  },
+  commands: {
+    copyOne: "Copy command",
+    removeOne: "Remove from history",
+    copyAll: "Copy all",
+    session: "Session",
+  },
+  archiveForm: {
+    folder: "Folder — e.g. concepts/panel",
+    description: "Description",
+    tags: "Tags, comma-separated",
+    submit: "Archive",
+  },
+  search: {
+    placeholder: "Search the archive — #tag filters",
+    minChars: "At least 3 characters — or press Enter.",
+    hits: "{count} hits {scope}",
+    noHits: "No hits for {scope}",
+  },
+  wiki: {
+    archive: "Archive",
+    docOne: "{count} document",
+    docMany: "{count} documents",
+    all: "All",
+    backlinks: "Links here",
+    backlinksLabel: "Links here: ",
+    emptyTag: "No documents tagged #{tag}.",
+    emptyArchive: "The archive is empty.",
+    emptyHint:
+      "To archive: the archive button in the draft, or “archive this” in the chat — with folder, description and tags.",
+    recent: "Recent",
+    root: "Root",
+    back: "‹ Archive",
+    noPage: "No wiki page loaded.",
+    openOverview: "Open archive overview",
+  },
+};
+
+export const messages = { de, en };
+
+/// Gewählte Sprache: der Schalter aus dem Hauptfenster (localStorage), sonst
+/// die Browser-Sprache. Beide Wege teilen sich den Schlüssel `lang` mit
+/// setLocale() in i18n.ts.
+export function storedLocale(): Locale {
+  // Über window und in try/catch: gesperrter Storage (privater Modus) wirft
+  // schon beim Lesen, und unter Node schattet ein undefiniertes Global das
+  // localStorage der Testumgebung.
+  let stored: string | null = null;
+  try {
+    stored = window.localStorage.getItem("lang");
+  } catch {
+    stored = null;
+  }
+  if (stored === "de" || stored === "en") return stored;
+  return navigator.language.startsWith("de") ? "de" : "en";
+}
+
+/// Übersetzt einen Punkt-Pfad (`panel.tabDraft`) und setzt `{platzhalter}` ein.
+/// Fehlt der Schlüssel, kommt der Pfad selbst zurück — im UI sichtbar statt
+/// still leer.
+export function t(key: string, params?: Record<string, string | number>): string {
+  const table: unknown = messages[storedLocale()];
+  const hit = key
+    .split(".")
+    .reduce<unknown>((o, part) => (o as Record<string, unknown>)?.[part], table);
+  if (typeof hit !== "string") return key;
+  return params
+    ? hit.replace(/\{(\w+)\}/g, (m, name) => String(params[name] ?? m))
+    : hit;
+}
+
+/// Beschriftet statisches Markup: `data-i18n` setzt den Textinhalt (auch am
+/// <title> im Kopf), `data-i18n-title`/`-aria`/`-placeholder` das jeweilige
+/// Attribut. Einmal beim Fensterstart aufgerufen — die Sprache wechselt erst
+/// mit dem nächsten Start, es gibt in diesen Fenstern keinen Umschalter.
+export function applyI18n(root: ParentNode = document) {
+  for (const el of root.querySelectorAll<HTMLElement>("[data-i18n]")) {
+    el.textContent = t(el.dataset.i18n!);
+  }
+  const attrs: [string, string][] = [
+    ["data-i18n-title", "title"],
+    ["data-i18n-aria", "aria-label"],
+    ["data-i18n-placeholder", "placeholder"],
+  ];
+  for (const [marker, attr] of attrs) {
+    for (const el of root.querySelectorAll<HTMLElement>(`[${marker}]`)) {
+      el.setAttribute(attr, t(el.getAttribute(marker)!));
+    }
+  }
+  document.documentElement.lang = storedLocale();
+}
diff --git a/src/panel-view.ts b/src/panel-view.ts
index e968597..9bfa968 100644
--- a/src/panel-view.ts
+++ b/src/panel-view.ts
@@ -1,6 +1,7 @@
 import { renderMarkdown } from "./markdown";
 import { writeText } from "@tauri-apps/plugin-clipboard-manager";
 import { flash } from "./commands-view";
+import { t } from "./messages";
 
 export interface PanelView {
   set(text: string): void;
@@ -37,7 +38,7 @@ function firstLine(text: string): string {
     if (t.startsWith("#") && h) return stripInlineMd(h);
     if (!fallback) fallback = t;
   }
-  return fallback ? stripInlineMd(fallback) : "Dokument";
+  return fallback ? stripInlineMd(fallback) : t("panel.tabDraft");
 }
 
 /// Ersetzt die erste Überschrift (bzw. legt eine an) im Rohtext durch `title`.
@@ -129,7 +130,7 @@ export function initPanelView(opts: {
       opts.content.className = "raw";
       opts.content.textContent = rawText;
     }
-    opts.modeBtn.textContent = rendered ? "MD" : "Roh";
+    opts.modeBtn.textContent = rendered ? t("panel.rendered") : t("panel.raw");
   }
 
   opts.modeBtn.addEventListener("click", () => {
diff --git a/src/panel.ts b/src/panel.ts
index 7a558a8..aee0bff 100644
--- a/src/panel.ts
+++ b/src/panel.ts
@@ -8,10 +8,12 @@ import { wirePanel } from "./panel-wiring";
 import { flash, panelToast } from "./commands-view";
 import { initArchiveForm } from "./archive-form";
 import { applyTheme, THEMES } from "./themes";
+import { applyI18n, t } from "./messages";
 
 // Abgelöstes Panel-Fenster: liest den aktuellen Entwurf einmal ein und folgt
 // danach denselben Update-Events wie das angedockte Panel; startet in
 // „Befehle", wenn es (noch) keinen Entwurf gibt.
+applyI18n();
 const project = new URLSearchParams(location.search).get("project")!;
 const win = getCurrentWebviewWindow();
 
@@ -110,7 +112,7 @@ const archiveForm = initArchiveForm(archiveBtn, async (meta) => {
     let dir: string | undefined;
     if (!configured) {
       const { open } = await import("@tauri-apps/plugin-dialog");
-      const chosen = await open({ directory: true, title: "Archiv-Ordner wählen" });
+      const chosen = await open({ directory: true, title: t("panel.chooseArchiveDir") });
       if (!chosen) return;
       dir = chosen as string;
     }
diff --git a/src/popup.ts b/src/popup.ts
index 0f64bfc..f58cf85 100644
--- a/src/popup.ts
+++ b/src/popup.ts
@@ -1,4 +1,5 @@
 import { createApp } from "vue";
 import Popup from "./components/Popup.vue";
+import { i18n } from "./i18n";
 
-createApp(Popup).mount("#app");
+createApp(Popup).use(i18n).mount("#app");
diff --git a/src/search-view.ts b/src/search-view.ts
index 5e36459..dfe5544 100644
--- a/src/search-view.ts
+++ b/src/search-view.ts
@@ -4,6 +4,8 @@
 /// gehen nie durch innerHTML; die `**…**`-Marker im Snippet werden per
 /// Split in <mark>-Elemente übersetzt.
 
+import { t } from "./messages";
+
 interface Hit {
   relpath: string;
   title: string;
@@ -34,7 +36,7 @@ export function initSearchView(
   bar.className = "hit-search";
   const input = document.createElement("input");
   input.type = "search";
-  input.placeholder = "Archiv durchsuchen — #tag filtert";
+  input.placeholder = t("search.placeholder");
   // Live-Suche ab 3 Zeichen, entprellt (300 ms Debounce); endet die Eingabe
   // mitten im Wort, wird das letzte Wort als Präfix gesucht (arch → arch*) —
   // außer es ist ein #tag-Token. Enter sucht sofort und wörtlich — für exakte
@@ -50,7 +52,7 @@ export function initSearchView(
       if (q) {
         const head = document.createElement("div");
         head.className = "hit-head";
-        head.textContent = "Mindestens 3 Zeichen — oder Enter.";
+        head.textContent = t("search.minChars");
         results.append(head);
       }
       return;
@@ -93,8 +95,8 @@ export function initSearchView(
     const tag = run.tag ? `#${run.tag}` : "";
     const scope = [what, tag].filter(Boolean).join(" · ");
     head.textContent = run.hits.length
-      ? `${run.hits.length} Treffer ${scope}`
-      : `Keine Treffer für ${scope}`;
+      ? t("search.hits", { count: run.hits.length, scope })
+      : t("search.noHits", { scope });
     results.append(head);
     for (const hit of run.hits) {
       const tile = document.createElement("div");
diff --git a/src/terminal.ts b/src/terminal.ts
index 66e3409..b5a8aa2 100644
--- a/src/terminal.ts
+++ b/src/terminal.ts
@@ -14,6 +14,7 @@ import { wirePanel } from "./panel-wiring";
 import { applyTheme, THEMES } from "./themes";
 import { flash, panelToast } from "./commands-view";
 import { initArchiveForm } from "./archive-form";
+import { applyI18n, t } from "./messages";
 
 // Debug-Instrumentierung: Fehler auf der Seite anzeigen und ins Dev-Log spiegeln.
 function showError(msg: string) {
@@ -31,6 +32,7 @@ window.addEventListener("unhandledrejection", (e) =>
   showError(`rejection: ${e.reason}\n${e.reason?.stack ?? ""}`),
 );
 
+applyI18n();
 const project = new URLSearchParams(location.search).get("project")!;
 const win = getCurrentWebviewWindow();
 
@@ -173,7 +175,9 @@ function b64ToBytes(b64: string): Uint8Array {
 }
 
 await win.listen<string>("pty-output", (e) => term.write(b64ToBytes(e.payload)));
-await win.listen("pty-exit", () => term.write("\r\n\x1b[90m[Prozess beendet]\x1b[0m\r\n"));
+await win.listen("pty-exit", () =>
+  term.write(`\r\n\x1b[90m${t("panel.processEnded")}\x1b[0m\r\n`),
+);
 
 term.onData((data) => invoke("term_write", { data }));
 term.onResize(({ rows, cols }) => invoke("term_resize", { rows, cols }));
@@ -258,7 +262,7 @@ const archiveForm = initArchiveForm(archiveBtn, async (meta) => {
     let dir: string | undefined;
     if (!configured) {
       const { open } = await import("@tauri-apps/plugin-dialog");
-      const chosen = await open({ directory: true, title: "Archiv-Ordner wählen" });
+      const chosen = await open({ directory: true, title: t("panel.chooseArchiveDir") });
       if (!chosen) return;
       dir = chosen as string;
     }
diff --git a/src/test-setup.ts b/src/test-setup.ts
new file mode 100644
index 0000000..b7d9f20
--- /dev/null
+++ b/src/test-setup.ts
@@ -0,0 +1,26 @@
+/// Testsprache festnageln: ohne das entscheidet `navigator.language` der
+/// Testumgebung über die erwarteten Texte (happy-dom liefert en-US), und die
+/// Erwartungen im Test hingen an einem Default, den keiner gesetzt hat.
+
+Object.defineProperty(window.navigator, "language", {
+  value: "de",
+  configurable: true,
+});
+
+/// Node 22 stellt ein globales `localStorage` bereit, das ohne
+/// --localstorage-file undefiniert ist und das der Testumgebung überschattet.
+/// Ein Speicher im Arbeitsspeicher reicht hier vollauf.
+const speicher = new Map<string, string>();
+Object.defineProperty(window, "localStorage", {
+  configurable: true,
+  value: {
+    getItem: (k: string) => speicher.get(k) ?? null,
+    setItem: (k: string, v: string) => void speicher.set(k, String(v)),
+    removeItem: (k: string) => void speicher.delete(k),
+    clear: () => speicher.clear(),
+    key: (i: number) => [...speicher.keys()][i] ?? null,
+    get length() {
+      return speicher.size;
+    },
+  },
+});
diff --git a/src/wiki-view.ts b/src/wiki-view.ts
index 4a026c4..6891123 100644
--- a/src/wiki-view.ts
+++ b/src/wiki-view.ts
@@ -7,6 +7,7 @@
 
 import { renderMarkdown } from "./markdown";
 import { linkWikiRefs } from "./panel-view";
+import { t } from "./messages";
 
 interface DocEntry {
   name: string;
@@ -72,14 +73,14 @@ export function initWikiView(
     left.className = "wiki-head-left";
     const title = document.createElement("div");
     title.className = "wiki-head-title";
-    title.textContent = p.tag ? `#${p.tag}` : "Archiv";
+    title.textContent = p.tag ? `#${p.tag}` : t("wiki.archive");
     const sub = document.createElement("div");
     sub.className = "wiki-head-sub";
     sub.textContent = p.home;
     left.append(title, sub);
     const count = document.createElement("div");
     count.className = "wiki-head-right";
-    count.textContent = `${p.total} ${p.total === 1 ? "Dokument" : "Dokumente"}`;
+    count.textContent = t(p.total === 1 ? "wiki.docOne" : "wiki.docMany", { count: p.total });
     head.append(left, count);
     return head;
   }
@@ -89,7 +90,7 @@ export function initWikiView(
   function tagBar(p: Page): HTMLElement {
     const bar = document.createElement("div");
     bar.className = "wiki-chips";
-    bar.append(chip("Alle", "tag:", !p.tag));
+    bar.append(chip(t("wiki.all"), "tag:", !p.tag));
     for (const t of p.tags) {
       bar.append(chip(`#${t.name} ${t.count}`, `tag:${t.name}`, p.tag === t.name));
     }
@@ -108,7 +109,7 @@ export function initWikiView(
     if (doc.backlinks) {
       const back = document.createElement("div");
       back.className = "wiki-doc-back";
-      back.title = "Verweise hierher";
+      back.title = t("wiki.backlinks");
       back.textContent = `↩ ${doc.backlinks}`;
       line.append(back);
     }
@@ -142,12 +143,10 @@ export function initWikiView(
       const empty = document.createElement("div");
       empty.className = "wiki-empty";
       const line = document.createElement("strong");
-      line.textContent = p.tag ? `Keine Dokumente mit #${p.tag}.` : "Das Archiv ist leer.";
+      line.textContent = p.tag ? t("wiki.emptyTag", { tag: p.tag }) : t("wiki.emptyArchive");
       empty.append(line);
       if (!p.tag) {
-        empty.append(
-          "Archivieren: Archiv-Button im Entwurf oder „archiviere das“ im Chat — mit Ordner, Beschreibung und Schlagwörtern.",
-        );
+        empty.append(t("wiki.emptyHint"));
       }
       container.append(empty);
       return;
@@ -155,7 +154,7 @@ export function initWikiView(
     if (p.recent.length) {
       const eyebrow = document.createElement("div");
       eyebrow.className = "wiki-folder";
-      eyebrow.textContent = "Zuletzt";
+      eyebrow.textContent = t("wiki.recent");
       container.append(eyebrow);
       for (const doc of p.recent) container.append(docRow(doc));
     }
@@ -168,7 +167,7 @@ export function initWikiView(
       } else if (p.recent.length) {
         const eyebrow = document.createElement("div");
         eyebrow.className = "wiki-folder";
-        eyebrow.textContent = "Wurzel";
+        eyebrow.textContent = t("wiki.root");
         container.append(eyebrow);
       }
       for (const doc of folder.docs) container.append(docRow(doc));
@@ -180,7 +179,7 @@ export function initWikiView(
     head.className = "wiki-doc-head";
     const back = document.createElement("button");
     back.className = "wiki-back";
-    back.textContent = "‹ Archiv";
+    back.textContent = t("wiki.back");
     back.addEventListener("click", () => onLink("tag:"));
     const path = document.createElement("div");
     path.className = "wiki-head-sub";
@@ -201,7 +200,7 @@ export function initWikiView(
     if (d.backlinks.length) {
       const back = document.createElement("div");
       back.className = "wiki-backlinks";
-      back.append("Verweise hierher: ");
+      back.append(t("wiki.backlinksLabel"));
       d.backlinks.forEach((name, i) => {
         if (i) back.append(" · ");
         const a = document.createElement("a");
@@ -223,9 +222,9 @@ export function initWikiView(
     const empty = document.createElement("div");
     empty.className = "wiki-empty";
     const line = document.createElement("strong");
-    line.textContent = "Keine Wiki-Seite geladen.";
+    line.textContent = t("wiki.noPage");
     empty.append(line);
-    empty.append(chip("Archiv-Übersicht öffnen", "tag:"));
+    empty.append(chip(t("wiki.openOverview"), "tag:"));
     container.append(empty);
   }
 
diff --git a/terminal.html b/terminal.html
index 5a920a2..f4e8b0b 100644
--- a/terminal.html
+++ b/terminal.html
@@ -2,7 +2,7 @@
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
-    <title>Terminal</title>
+    <title data-i18n="panel.windowTerminal">Terminal</title>
     <style>
       /* Theme-Variablen — Defaults sind Mocha; applyTheme (themes.ts) überschreibt. */
       :root {
@@ -457,22 +457,22 @@
       <img id="project-icon" hidden data-tauri-drag-region />
       <span id="project-name" data-tauri-drag-region></span>
       <div class="panel-tabs" id="panel-tabs">
-        <button class="panel-btn" data-mode="commands" title="Befehls-History">Befehle</button>
+        <button class="panel-btn" data-mode="commands" data-i18n-title="panel.tabCommandsTitle" data-i18n="panel.tabCommands">Befehle</button>
         <span class="tab-sep"></span>
-        <button class="panel-btn" data-mode="draft" title="Dokument">Dokument</button>
-        <button class="panel-btn" data-mode="wiki" title="Archiv-Wiki">Wiki</button>
-        <button class="panel-btn" data-mode="search" title="Suchtreffer">Suche</button>
+        <button class="panel-btn" data-mode="draft" data-i18n-title="panel.tabDraftTitle" data-i18n="panel.tabDraft">Dokument</button>
+        <button class="panel-btn" data-mode="wiki" data-i18n-title="panel.tabWikiTitle" data-i18n="panel.tabWiki">Wiki</button>
+        <button class="panel-btn" data-mode="search" data-i18n-title="panel.tabSearchTitle" data-i18n="panel.tabSearch">Suche</button>
         <span class="tab-sep"></span>
       </div>
       <span id="pool"></span>
       <div id="winbtns">
-        <button class="winbtn" id="win-min" aria-label="Minimieren">
+        <button class="winbtn" id="win-min" data-i18n-aria="panel.minimize">
           <svg width="12" height="12" viewBox="0 0 12 12"><line x1="2" y1="6.5" x2="10" y2="6.5" /></svg>
         </button>
-        <button class="winbtn" id="win-max" aria-label="Maximieren">
+        <button class="winbtn" id="win-max" data-i18n-aria="panel.maximize">
           <svg width="12" height="12" viewBox="0 0 12 12" fill="none"><rect x="2.5" y="2.5" width="7" height="7" rx="1" /></svg>
         </button>
-        <button class="winbtn close" id="win-close" aria-label="Schließen">
+        <button class="winbtn close" id="win-close" data-i18n-aria="panel.close">
           <svg width="12" height="12" viewBox="0 0 12 12"><line x1="2.7" y1="2.7" x2="9.3" y2="9.3" /><line x1="9.3" y1="2.7" x2="2.7" y2="9.3" /></svg>
         </button>
       </div>
@@ -483,17 +483,17 @@
       <aside id="panel" hidden>
         <div class="panel-head">
           <div class="panel-titlerow">
-            <span class="panel-title">Dokument</span>
-            <button class="panel-btn panel-edit draft-only" id="panel-title-edit" title="Titel bearbeiten">✎</button>
-            <button class="panel-btn" id="panel-detach" title="In eigenes Fenster ablösen">
+            <span class="panel-title" data-i18n="panel.tabDraft">Dokument</span>
+            <button class="panel-btn panel-edit draft-only" id="panel-title-edit" data-i18n-title="panel.editTitle">✎</button>
+            <button class="panel-btn" id="panel-detach" data-i18n-title="panel.detach">
               <svg width="14" height="14" viewBox="0 0 16 16"><path d="M12.5 8.5V13a1 1 0 0 1-1 1H3a1 1 0 0 1-1-1V4.5a1 1 0 0 1 1-1h4.5" /><path d="M10 2h4v4" /><path d="M14 2 8 8" /></svg>
             </button>
-            <button class="panel-btn" id="panel-hide" title="Panel ausblenden">
+            <button class="panel-btn" id="panel-hide" data-i18n-title="panel.hidePanel">
               <svg width="12" height="12" viewBox="0 0 12 12"><path d="M3 3l6 6M9 3l-6 6" /></svg>
             </button>
           </div>
           <div class="panel-actions">
-            <select class="panel-lang draft-only" id="panel-lang" title="Sprache der Rechtschreibprüfung">
+            <select class="panel-lang draft-only" id="panel-lang" data-i18n-title="panel.spellcheckLang">
               <option value="de">DE</option>
               <option value="en">EN</option>
               <option value="en-GB">EN-GB</option>
@@ -502,17 +502,17 @@
               <option value="it">IT</option>
               <option value="nl">NL</option>
             </select>
-            <button class="panel-btn draft-only" id="panel-wiki-jump" title="Im Wiki öffnen">
+            <button class="panel-btn draft-only" id="panel-wiki-jump" data-i18n-title="panel.openInWiki">
               <svg width="14" height="14" viewBox="0 0 16 16"><path d="M8 3.5C6.6 2.4 4.6 2 2.5 2v11c2.1 0 4.1.4 5.5 1.5 1.4-1.1 3.4-1.5 5.5-1.5V2c-2.1 0-4.1.4-5.5 1.5z" /><path d="M8 3.5v11" /></svg>
             </button>
-            <button class="panel-btn draft-only" id="panel-mode" title="Rohtext / gerendert">MD</button>
-            <button class="panel-btn draft-only" id="panel-content-edit" title="Entwurf bearbeiten (Cmd/Ctrl+Enter speichert, Esc verwirft)">
+            <button class="panel-btn draft-only" id="panel-mode" data-i18n-title="panel.toggleRaw" data-i18n="panel.rendered">MD</button>
+            <button class="panel-btn draft-only" id="panel-content-edit" data-i18n-title="panel.editDraft">
               <svg width="14" height="14" viewBox="0 0 16 16"><path d="M10.8 2.6 13.4 5.2 6 12.6l-3.1.5.5-3.1z" /><path d="M9.7 3.7 12.3 6.3" /></svg>
             </button>
-            <button class="panel-btn draft-only" id="panel-copy" title="In die Zwischenablage kopieren">
+            <button class="panel-btn draft-only" id="panel-copy" data-i18n-title="panel.copy">
               <svg width="14" height="14" viewBox="0 0 16 16"><rect x="5.5" y="5.5" width="8" height="8" rx="1.5" /><path d="M10.5 3.2V3A1.5 1.5 0 0 0 9 1.5H3A1.5 1.5 0 0 0 1.5 3v6A1.5 1.5 0 0 0 3 10.5h.2" /></svg>
             </button>
-            <button class="panel-btn draft-only" id="panel-archive" title="In den Archiv-Ordner speichern">
+            <button class="panel-btn draft-only" id="panel-archive" data-i18n-title="panel.archive">
               <svg width="14" height="14" viewBox="0 0 16 16"><rect x="1.5" y="2.5" width="13" height="3.5" rx="1" /><path d="M2.8 6v6.5a1 1 0 0 0 1 1h8.4a1 1 0 0 0 1-1V6" /><path d="M6.3 9h3.4" /></svg>
             </button>
           </div>
diff --git a/vitest.config.ts b/vitest.config.ts
index 6aa22e8..841521b 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -4,5 +4,6 @@ export default defineConfig({
   test: {
     environment: "happy-dom",
     include: ["src/**/*.test.ts"],
+    setupFiles: ["src/test-setup.ts"],
   },
 });
