diff --git a/frontend/js/ai.js b/frontend/js/ai.js
index 73ef02c..928ab58 100644
--- a/frontend/js/ai.js
+++ b/frontend/js/ai.js
@@ -220,7 +220,7 @@ export async function createAIToolbar(container, getEditorView) {
   if (!aiConfigured) {
     const hint = document.createElement('div');
     hint.style.cssText = 'padding:6px 12px;font-size:0.7rem;color:var(--text-muted);border-bottom:1px solid var(--border-color)';
-    hint.textContent = '⚠️ AI non configuré — ajouter DEEPSEEK_API_KEY, OPENROUTER_API_KEY ou GEMINI_API_KEY dans .env';
+    hint.textContent = t('ai.not_configured');
     container.appendChild(hint);
     return;
   }
@@ -256,7 +256,7 @@ export async function createAIToolbar(container, getEditorView) {
     padding: '3px 8px',
     borderRadius: '4px',
   });
-  aiBtn.title = 'AI Inline Completion (Ctrl+J) — Complète le texte automatiquement';
+  aiBtn.title = t('ai.inline_completion_title');
   aiBtn.addEventListener('click', async () => {
     const v = ev();
     if (!v) return;
@@ -268,7 +268,7 @@ export async function createAIToolbar(container, getEditorView) {
     try {
       const result = await aiAction('inline-complete', text);
       replaceSelection(v, result, 'append');
-      showToast('AI: complétion ajoutée', 'success');
+      showToast(t('ai.completion_added'), 'success');
     } catch (e) {
       showToast('AI: ' + (String(e.message || e).includes('401') ? 'clé API invalide' : e.message), 'error');
     } finally {
@@ -312,8 +312,8 @@ export async function createAIToolbar(container, getEditorView) {
   // ── Custom Rewrite ──
   const rewriteBtn = document.createElement('button');
   rewriteBtn.className = 'ai-toolbar-btn';
-  rewriteBtn.innerHTML = '💬 Réécrire';
-  rewriteBtn.title = 'Réécrit le texte selon vos instructions';
+  rewriteBtn.innerHTML = t('ai.rewrite');
+  rewriteBtn.title = t('ai.rewrite_title');
   Object.assign(rewriteBtn.style, {
     fontSize: '0.7rem',
     background: 'transparent',
@@ -332,7 +332,7 @@ export async function createAIToolbar(container, getEditorView) {
     try {
       const result = await aiAction('rewrite', text, { instruction });
       replaceSelection(v, result);
-      showToast('AI: texte réécrit', 'success');
+      showToast(t('ai.text_rewritten'), 'success');
     } catch (e) {
       showToast('AI: ' + (String(e.message || e).includes('401') ? 'clé API invalide' : e.message), 'error');
     }
@@ -364,10 +364,10 @@ export async function createAIToolbar(container, getEditorView) {
     if (!v) return;
     const text = getSelection(v);
     if (!text.trim()) {
-      showToast('AI: sélectionnez du texte à traiter', 'warning');
+      showToast(t('ai.select_text'), 'warning');
       return;
     }
-    showToast('⏳ AI: traitement en cours...', 'info');
+    showToast(t('ai.processing'), 'info');
 
     // Show processing indicator in the editor header
     _showProcessingIndicator(true);
@@ -377,13 +377,13 @@ export async function createAIToolbar(container, getEditorView) {
     try {
       const result = await aiAction(endpoint, text, extra);
       replaceSelection(v, result, mode);
-      showToast('AI: texte traité ✓', 'success');
+      showToast(t('ai.text_processed'), 'success');
     } catch (e) {
       const msg = String(e.message || e);
       if (msg.includes('401')) {
-        showToast('AI: clé API invalide. Vérifiez DEEPSEEK_API_KEY dans .env', 'error');
+        showToast(t('ai.invalid_api_key'), 'error');
       } else if (msg.includes('402') || msg.includes('429')) {
-        showToast('AI: quota dépassé ou paiement requis', 'error');
+        showToast(t('ai.quota_exceeded'), 'error');
       } else {
         showToast('AI: ' + msg, 'error');
       }
diff --git a/frontend/js/app.js b/frontend/js/app.js
index 61e2741..404116e 100644
--- a/frontend/js/app.js
+++ b/frontend/js/app.js
@@ -84,7 +84,7 @@ async function init() {
       }
     } catch (err) {
       console.error("Failed to initialize ObsiGate:", err);
-      UI.showToast("Erreur lors de l'initialisation", "error");
+      UI.showToast(t("error.initialization"), "error");
     }
   }
 
diff --git a/frontend/js/auth.js b/frontend/js/auth.js
index 065606b..b0f04da 100644
--- a/frontend/js/auth.js
+++ b/frontend/js/auth.js
@@ -195,7 +195,7 @@ const AuthManager = {
       userMenu.innerHTML = "";
       return;
     }
-    userMenu.innerHTML = '<span class="user-display-name">' + (user.display_name || user.username) + "</span>" + '<button class="btn-logout" id="logout-btn" title="Déconnexion"><i data-lucide="log-out" style="width:14px;height:14px"></i></button>';
+    userMenu.innerHTML = '<span class="user-display-name">' + (user.display_name || user.username) + "</span>" + '<button class="btn-logout" id="logout-btn" title="' + t('auth.logout_title') + '"><i data-lucide="log-out" style="width:14px;height:14px"></i></button>';
     safeCreateIcons();
 
     const logoutBtn = document.getElementById("logout-btn");
@@ -535,14 +535,14 @@ const AdminPanel = {
   async _deleteUser(username) {
     const currentUser = AuthManager.getUser();
     if (currentUser && currentUser.username === username) {
-      showToast("Impossible de supprimer son propre compte", "error");
+      showToast(t("auth.cannot_delete_self"), "error");
       return;
     }
     if (!confirm("Supprimer l'utilisateur \"" + username + '" ?')) return;
     try {
       await api("/api/auth/admin/users/" + username, { method: "DELETE" });
       this._loadUsers();
-      showToast("Utilisateur supprimé", "success");
+      showToast(t("auth.user_deleted"), "success");
     } catch (err) {
       showToast(err.message, "error");
     }
diff --git a/frontend/js/backup-manager.js b/frontend/js/backup-manager.js
index d9c8e26..ba7bc00 100644
--- a/frontend/js/backup-manager.js
+++ b/frontend/js/backup-manager.js
@@ -235,7 +235,7 @@ async function previewBackup(fpath) {
 async function restoreBackup(vault, file) {
   // Find the backup timestamp from the currently selected backup
   var item = document.querySelector('.bm-backup-item.active');
-  if (!item) { showToast('Selectionnez un backup a restaurer', 'error'); return; }
+  if (!item) { showToast(t('backup.select_to_restore'), 'error'); return; }
 
   var backupPath = item.dataset.path;
   // Extract timestamp from the filename
@@ -248,7 +248,7 @@ async function restoreBackup(vault, file) {
       break;
     }
   }
-  if (!ts) { showToast('Impossible de trouver le timestamp du backup', 'error'); return; }
+  if (!ts) { showToast(t('backup.timestamp_not_found'), 'error'); return; }
 
   if (!confirm('Restaurer "' + file + '" a la version du backup selectionne ?\nLa version actuelle sera sauvegardee.')) return;
 
@@ -259,7 +259,7 @@ async function restoreBackup(vault, file) {
       body: JSON.stringify({ version: ts }),
     });
     if (resp && resp.success) {
-      showToast('Fichier restaure avec succes', 'success');
+      showToast(t('backup.file_restored'), 'success');
       load();
     }
   } catch (err) {
diff --git a/frontend/js/backups.js b/frontend/js/backups.js
index ff21204..fb3fdd2 100644
--- a/frontend/js/backups.js
+++ b/frontend/js/backups.js
@@ -337,14 +337,14 @@ async function restoreBackup() {
     );
 
     if (resp && resp.success) {
-      showToast('Fichier restaure avec succes', 'success');
+      showToast(t('backup.file_restored'), 'success');
       await refreshSidebarTreePreservingState();
       close();
       if (typeof TabManager !== 'undefined' && TabManager.reloadCurrent) {
         TabManager.reloadCurrent();
       }
     } else {
-      showToast('Echec de la restauration', 'error');
+      showToast(t('backup.restore_failed'), 'error');
     }
   } catch (err) {
     showToast('Erreur: ' + ((err && err.detail) || (err && err.message) || 'Unknown'), 'error');
diff --git a/frontend/js/config.js b/frontend/js/config.js
index 2332ca7..ddaa0e7 100644
--- a/frontend/js/config.js
+++ b/frontend/js/config.js
@@ -801,7 +801,7 @@ async function saveBackendConfig() {
     }
   } catch (err) {
     console.error("Failed to save backend config:", err);
-    showToast("Erreur de sauvegarde", "error");
+    showToast(t("config.save_error"), "error");
   }
 }
 
@@ -809,7 +809,7 @@ async function forceReindex() {
   const btn = document.getElementById("cfg-reindex");
   if (btn) {
     btn.disabled = true;
-    btn.textContent = "Réindexation...";
+    btn.textContent = t('config.reindexing');
   }
   try {
     await api("/api/index/reload");
@@ -818,11 +818,11 @@ async function forceReindex() {
     await Promise.all([loadVaults(), loadTags()]);
   } catch (err) {
     console.error("Reindex error:", err);
-    showToast("Erreur de réindexation", "error");
+    showToast(t("config.reindex_error"), "error");
   } finally {
     if (btn) {
       btn.disabled = false;
-      btn.textContent = "Forcer réindexation";
+      btn.textContent = t('config.force_reindex');
     }
   }
 }
@@ -1067,7 +1067,7 @@ async function saveHiddenFilesSettings() {
     // Reload vault settings to update the cache
     await loadVaultSettings();
 
-    showToast("✓ Paramètres sauvegardés", "success");
+    showToast(t("config.settings_saved"), "success");
 
     // Refresh the UI to apply the filter
     await Promise.all([refreshSidebarTreePreservingState(), refreshTagsForContext()]);
@@ -1113,7 +1113,7 @@ document.addEventListener("click", function(e) {
   if (e.target.id === "webhook-add-btn") {
     const name = document.getElementById("webhook-name-input").value.trim();
     const url = document.getElementById("webhook-url-input").value.trim();
-    if (!url) { showToast("URL requise", "error"); return; }
+    if (!url) { showToast(t("config.url_required"), "error"); return; }
     api("/api/webhooks", { method: "POST", body: JSON.stringify({ name: name || "Webhook", url, events: ["file_created","file_deleted","file_modified","file_renamed"] }) }).then(() => { loadWebhooksUI(); document.getElementById("webhook-name-input").value = ""; document.getElementById("webhook-url-input").value = ""; }).catch(err => showToast(err.message, "error"));
   }
 });
@@ -1186,13 +1186,13 @@ export async function openShareDialog(vault, path) {
           document.body.appendChild(ta); ta.select(); document.execCommand("copy");
           document.body.removeChild(ta);
         }
-        showToast("Lien copié !", "success");
+        showToast(t("config.link_copied"), "success");
         div.remove();
       });
       div.querySelector(".share-revoke-btn").addEventListener("click", async () => {
         try {
           await api(`/api/share/${existingShare.id}`, { method: "DELETE" });
-          showToast("Partage révoqué", "success");
+          showToast(t("config.share_revoked"), "success");
           existingShare = null;
           renderContent();
         } catch (err) { showToast("Erreur: " + err.message, "error"); }
@@ -1228,7 +1228,7 @@ export async function openShareDialog(vault, path) {
           });
           existingShare = share;
           renderContent();
-          showToast("Lien créé !", "success");
+          showToast(t("config.link_created"), "success");
         } catch (err) { showToast("Erreur: " + err.message, "error"); }
       });
     }
@@ -1365,10 +1365,10 @@ async function saveAIKeys() {
     const input = document.getElementById(id);
     if (input && input.value.trim()) keys[name] = input.value.trim();
   }
-  if (!Object.keys(keys).length) { showToast("Aucune cle a sauvegarder", "warning"); return; }
+  if (!Object.keys(keys).length) { showToast(t("config.no_keys"), "warning"); return; }
   try {
     await api("/api/config/ai-keys", { method: "POST", body: JSON.stringify(keys) });
-    showToast("Cles API sauvegardees", "success");
+    showToast(t("config.api_keys_saved"), "success");
     // Clear inputs
     Object.keys(map).forEach(id => { const el = document.getElementById(id); if (el) el.value = ""; });
     loadAIKeys();
@@ -1461,8 +1461,8 @@ function initThemePicker() {
       // Mode toggle
       var toggle = document.createElement('div');
       toggle.className = 'theme-mode-toggle';
-      var dBtn = elBtn('Sombre', 'dark', mode);
-      var lBtn = elBtn('Clair', 'light', mode);
+      var dBtn = elBtn(t('theme.dark'), 'dark', mode);
+      var lBtn = elBtn(t('theme.light'), 'light', mode);
       toggle.appendChild(dBtn);
       toggle.appendChild(lBtn);
       grid.appendChild(toggle);
diff --git a/frontend/js/dashboard.js b/frontend/js/dashboard.js
index b0932ec..7c598ae 100644
--- a/frontend/js/dashboard.js
+++ b/frontend/js/dashboard.js
@@ -83,7 +83,7 @@ const DashboardSharedWidget = {
         e.stopPropagation();
         const url = b.dataset.url;
         try { await navigator.clipboard.writeText(url); } catch { const ta = document.createElement("textarea"); ta.value=url; ta.style.position="fixed"; ta.style.left="-9999px"; document.body.appendChild(ta); ta.select(); document.execCommand("copy"); document.body.removeChild(ta); }
-        showToast("Lien copié !", "success");
+        showToast(t("config.link_copied"), "success");
       }));
       grid.querySelectorAll(".shared-open-btn").forEach(b => b.addEventListener("click", (e) => {
         e.stopPropagation();
@@ -93,7 +93,7 @@ const DashboardSharedWidget = {
       grid.querySelectorAll(".shared-revoke-btn").forEach(b => b.addEventListener("click", async (e) => {
         e.stopPropagation();
         await api(`/api/share/${b.dataset.id}`, { method: "DELETE" });
-        showToast("Partage révoqué", "success");
+        showToast(t("config.share_revoked"), "success");
         this.load();
       }));
       grid.querySelectorAll(".shared-card").forEach(card => card.addEventListener("click", () => {
@@ -147,7 +147,7 @@ const DashboardConflictsWidget = {
   async _resolve(d, action) {
     try {
       await api("/api/conflicts/resolve", { method: "POST", body: JSON.stringify({ vault: d.vault, conflict_path: d.conflict, original_path: d.original, action }) });
-      showToast("Conflit résolu", "success");
+      showToast(t("dashboard.conflict_resolved"), "success");
       this.load();
     } catch (err) { showToast("Erreur: " + err.message, "error"); }
   }
@@ -204,7 +204,7 @@ const DashboardRecentWidget = {
       });
     } catch (err) {
       console.error("Failed to toggle bookmark:", err);
-      showToast("Erreur lors de l'épinglage", "error");
+      showToast(t("dashboard.pin_error"), "error");
     }
   },
 
diff --git a/frontend/js/dragdrop.js b/frontend/js/dragdrop.js
index 8aeff60..2c56e27 100644
--- a/frontend/js/dragdrop.js
+++ b/frontend/js/dragdrop.js
@@ -235,7 +235,7 @@ async function onDrop(e) {
 
   // Don't move if source and target are the same vault
   if (vault !== targetVault) {
-    showToast('Cross-vault moves are not supported', 'error');
+    showToast(t('dragdrop.cross_vault_unsupported'), 'error');
     onDragEnd();
     return;
   }
@@ -262,7 +262,7 @@ async function onDrop(e) {
       // Refresh the tree preserving expanded state
       await refreshSidebarTreePreservingState();
     } else {
-      showToast('Move failed', 'error');
+      showToast(t('dragdrop.move_failed'), 'error');
     }
   } catch (err) {
     console.error('Drag & drop move failed:', err);
diff --git a/frontend/js/offline.js b/frontend/js/offline.js
index a3c53db..d893423 100644
--- a/frontend/js/offline.js
+++ b/frontend/js/offline.js
@@ -21,9 +21,9 @@ export async function initOffline() {
     updateOfflineIndicator();
     if (online) {
       syncPendingChanges();
-      showToast('Connexion retablie — synchronisation en cours...', 'info');
+      showToast(t('offline.reconnected'), 'info');
     } else {
-      showToast('Mode hors-ligne — vos modifications seront synchronisees au retour', 'warning');
+      showToast(t('offline.mode_offline'), 'warning');
     }
   });
 
@@ -182,7 +182,7 @@ export async function syncPendingChanges() {
     updateOfflineIndicator();
 
     if (remaining === 0) {
-      showToast('Toutes les modifications ont ete synchronisees', 'success');
+      showToast(t('offline.all_synced'), 'success');
     } else {
       showToast(remaining + ' modification(s) en attente de resolution', 'warning');
     }
diff --git a/frontend/js/search.js b/frontend/js/search.js
index 3a49c1e..4012cde 100644
--- a/frontend/js/search.js
+++ b/frontend/js/search.js
@@ -984,7 +984,7 @@ export function renderAdvancedSearchResults(data, query, tagFilter) {
           exclude_paths: exclEl?.value || "",
         }),
       });
-      showToast("Recherche sauvegardée", "success");
+      showToast(t("search.saved"), "success");
       loadSavedSearches();
     } catch (err) { showToast("Erreur: " + err.message, "error"); }
   });
@@ -1128,7 +1128,7 @@ export function renderAdvancedSearchResults(data, query, tagFilter) {
   if (data.total > state.ADVANCED_SEARCH_LIMIT) {
     const paginationDiv = el("div", { class: "search-pagination" });
     const prevBtn = el("button", { class: "search-pagination__btn", type: "button" });
-    prevBtn.textContent = "← Précédent";
+    prevBtn.textContent = t('search.previous');
     prevBtn.disabled = state.advancedSearchOffset === 0;
     prevBtn.addEventListener("click", () => {
       state.advancedSearchOffset = Math.max(0, state.advancedSearchOffset - state.ADVANCED_SEARCH_LIMIT);
diff --git a/frontend/js/sidebar.js b/frontend/js/sidebar.js
index 845112f..fd18911 100644
--- a/frontend/js/sidebar.js
+++ b/frontend/js/sidebar.js
@@ -223,7 +223,7 @@ async function loadVaults() {
   container.innerHTML = "";
 
   // Prepare dropdown options
-  const dropdownOptions = [{ value: "all", text: "Tous les vaults" }, ...vaults.map((v) => ({ value: v.name, text: v.name }))];
+  const dropdownOptions = [{ value: "all", text: t('help.all_vaults') }, ...vaults.map((v) => ({ value: v.name, text: v.name }))];
 
   // Populate custom dropdowns
   populateCustomDropdown("vault-filter-dropdown", dropdownOptions, "all");
diff --git a/frontend/js/sidebar_raw.js b/frontend/js/sidebar_raw.js
index 78c708a..e454eda 100644
--- a/frontend/js/sidebar_raw.js
+++ b/frontend/js/sidebar_raw.js
@@ -201,7 +201,7 @@ async function loadVaults() {
   container.innerHTML = "";
 
   // Prepare dropdown options
-  const dropdownOptions = [{ value: "all", text: "Tous les vaults" }, ...vaults.map((v) => ({ value: v.name, text: v.name }))];
+  const dropdownOptions = [{ value: "all", text: t('help.all_vaults') }, ...vaults.map((v) => ({ value: v.name, text: v.name }))];
 
   // Populate custom dropdowns
   populateCustomDropdown("vault-filter-dropdown", dropdownOptions, "all");
diff --git a/frontend/js/sync.js b/frontend/js/sync.js
index 745707e..d745e2f 100644
--- a/frontend/js/sync.js
+++ b/frontend/js/sync.js
@@ -187,7 +187,7 @@ export const IndexUpdateManager = (() => {
   async function _onIndexReloaded(data) {
     connectionState = "syncing";
     _updateBadge();
-    showToast("Index complet rechargé", "info");
+    showToast(t("sync.index_reloaded"), "info");
     try {
       await Promise.all([loadVaults(), loadTags()]);
     } catch (err) {
@@ -562,7 +562,7 @@ window.addEventListener("beforeinstallprompt", (e) => {
 // Log when app is installed
 window.addEventListener("appinstalled", () => {
   console.log("[PWA] ObsiGate has been installed");
-  showToast("ObsiGate installé avec succès !", "success");
+  showToast(t("sync.install_success"), "success");
 });
 
 // ── Dashboard tab switching (runs on page load and after rebuild) ──
diff --git a/frontend/js/ui.js b/frontend/js/ui.js
index d215e92..9babb75 100644
--- a/frontend/js/ui.js
+++ b/frontend/js/ui.js
@@ -153,7 +153,7 @@ export function applyTheme(theme) {
     if (icon) {
       icon.setAttribute("data-lucide", theme === "dark" ? "moon" : "sun");
     }
-    themeLabel.textContent = theme === "dark" ? "Sombre" : "Clair";
+    themeLabel.textContent = theme === "dark" ? t('theme.dark') : t('theme.light');
     safeCreateIcons();
   }
 
@@ -860,7 +860,7 @@ const FileOperations = {
     // Find the text span (.tree-item-text) — tree items use spans, not direct text nodes
     const textSpan = item.querySelector('.tree-item-text');
     if (!textSpan) {
-      showToast('Impossible de renommer cet élément', 'error');
+      showToast(t('ui.cannot_rename'), 'error');
       return;
     }
 
@@ -1586,7 +1586,7 @@ async function init() {
       }
     } catch (err) {
       console.error("Failed to initialize ObsiGate:", err);
-      showToast("Erreur lors de l'initialisation", "error");
+      showToast(t("error.initialization"), "error");
     }
   }
 
diff --git a/frontend/js/viewer.js b/frontend/js/viewer.js
index 73daa2a..6e88c2a 100644
--- a/frontend/js/viewer.js
+++ b/frontend/js/viewer.js
@@ -360,7 +360,7 @@ export async function openFile(vaultName, filePath) {
         offline: true
       };
       renderFile(fakeData);
-      showToast('Fichier charge depuis le cache hors-ligne', 'info');
+      showToast(t('viewer.loaded_from_cache'), 'info');
     } else {
       area.innerHTML = '<div class="welcome"><p style="color:var(--text-muted)">Impossible de charger le fichier — vous etes hors-ligne et ce fichier n\'est pas en cache.</p></div>';
     }
@@ -488,11 +488,11 @@ export function renderFile(data) {
         document.execCommand("copy");
         document.body.removeChild(ta);
       }
-      copyBtn.lastChild.textContent = "Copié !";
-      setTimeout(() => (copyBtn.lastChild.textContent = "Copier"), 1500);
+      copyBtn.lastChild.textContent = t('viewer.copied');
+      setTimeout(() => (copyBtn.lastChild.textContent = t('viewer.copy')), 1500);
     } catch (err) {
       console.error("Copy error:", err);
-      showToast("Erreur lors de la copie", "error");
+      showToast(t("viewer.copy_error"), "error");
     }
   });
 
@@ -567,7 +567,7 @@ export function renderFile(data) {
       const shares = await api("/api/shares");
       if (shares.some(s => s.vault === data.vault && s.path === data.path)) {
         shareBtn.classList.add("shared");
-        shareBtn.title = "Document partagé — cliquer pour gérer";
+        shareBtn.title = t('viewer.shared_doc_title');
       }
     } catch (e) { /* ignore */ }
   })();
@@ -1331,7 +1331,7 @@ const IndexUpdateManager = (() => {
   async function _onIndexReloaded(data) {
     connectionState = "syncing";
     _updateBadge();
-    showToast("Index complet rechargé", "info");
+    showToast(t("sync.index_reloaded"), "info");
     try {
       await Promise.all([loadVaults(), loadTags()]);
     } catch (err) {
diff --git a/frontend/locales/en.json b/frontend/locales/en.json
index e350b22..ee0fe03 100644
--- a/frontend/locales/en.json
+++ b/frontend/locales/en.json
@@ -984,5 +984,56 @@
   "help.graph_nodes": "Nodes",
   "help.graph_info": "Info panel",
   "help.graph_export": "Export PNG",
-  "help.graph_context": "Context menu"
-}
\ No newline at end of file
+  "help.graph_context": "Context menu",
+  "ai.completion_added": "AI: completion added",
+  "ai.invalid_api_key": "AI: invalid API key. Check DEEPSEEK_API_KEY in .env",
+  "ai.processing": "⏳ AI: processing...",
+  "ai.quota_exceeded": "AI: quota exceeded or payment required",
+  "ai.select_text": "AI: select text to process",
+  "ai.text_processed": "AI: text processed ✓",
+  "ai.text_rewritten": "AI: text rewritten",
+  "auth.cannot_delete_self": "Cannot delete your own account",
+  "auth.user_deleted": "User deleted",
+  "backup.file_restored": "File restored successfully",
+  "backup.restore_failed": "Restore failed",
+  "backup.select_to_restore": "Select a backup to restore",
+  "backup.timestamp_not_found": "Cannot find backup timestamp",
+  "button.cancel": "Cancel",
+  "config.api_keys_saved": "API keys saved",
+  "config.link_copied": "Link copied!",
+  "config.link_created": "Link created!",
+  "config.no_keys": "No keys to save",
+  "config.reindex_error": "Reindex error",
+  "config.save_error": "Save error",
+  "config.settings_saved": "✓ Settings saved",
+  "config.share_revoked": "Share revoked",
+  "config.url_required": "URL required",
+  "dashboard.conflict_resolved": "Conflict resolved",
+  "dashboard.pin_error": "Pin error",
+  "dragdrop.cross_vault_unsupported": "Cross-vault moves are not supported",
+  "dragdrop.move_failed": "Move failed",
+  "error.initialization": "Initialization error",
+  "offline.all_synced": "All changes synced",
+  "offline.mode_offline": "Offline mode — changes will sync when back online",
+  "offline.reconnected": "Connection restored — synchronizing...",
+  "search.saved": "Search saved",
+  "sync.index_reloaded": "Full index reloaded",
+  "sync.install_success": "ObsiGate installed successfully!",
+  "toast.dir_renamed": "Directory renamed",
+  "toast.file_deleted": "File deleted",
+  "toast.file_renamed": "File renamed",
+  "ui.cannot_rename": "Cannot rename this item",
+  "ui.element_not_found": "Element not found in tree",
+  "viewer.copy_error": "Copy error",
+  "viewer.loaded_from_cache": "File loaded from offline cache",
+  "ai.not_configured": "⚠️ AI not configured — add DEEPSEEK_API_KEY, OPENROUTER_API_KEY or GEMINI_API_KEY in .env",
+  "ai.inline_completion_title": "AI Inline Completion (Ctrl+J) — Auto-complete text",
+  "ai.rewrite": "💬 Rewrite",
+  "ai.rewrite_title": "Rewrite text according to your instructions",
+  "auth.logout_title": "Sign out",
+  "config.reindexing": "Reindexing...",
+  "config.force_reindex": "Force reindex",
+  "search.previous": "← Previous",
+  "viewer.copied": "Copied!",
+  "viewer.shared_doc_title": "Shared document — click to manage"
+}
diff --git a/frontend/locales/fr.json b/frontend/locales/fr.json
index 85c32ab..e6dfe4d 100644
--- a/frontend/locales/fr.json
+++ b/frontend/locales/fr.json
@@ -984,5 +984,56 @@
   "help.graph_nodes": "Nœuds",
   "help.graph_info": "Panneau d'info",
   "help.graph_export": "Export PNG",
-  "help.graph_context": "Menu contextuel"
-}
\ No newline at end of file
+  "help.graph_context": "Menu contextuel",
+  "ai.completion_added": "AI: complétion ajoutée",
+  "ai.invalid_api_key": "AI: clé API invalide. Vérifiez DEEPSEEK_API_KEY dans .env",
+  "ai.processing": "⏳ AI: traitement en cours...",
+  "ai.quota_exceeded": "AI: quota dépassé ou paiement requis",
+  "ai.select_text": "AI: sélectionnez du texte à traiter",
+  "ai.text_processed": "AI: texte traité ✓",
+  "ai.text_rewritten": "AI: texte réécrit",
+  "auth.cannot_delete_self": "Impossible de supprimer son propre compte",
+  "auth.user_deleted": "Utilisateur supprimé",
+  "backup.file_restored": "Fichier restauré avec succès",
+  "backup.restore_failed": "Échec de la restauration",
+  "backup.select_to_restore": "Sélectionnez un backup à restaurer",
+  "backup.timestamp_not_found": "Impossible de trouver le timestamp du backup",
+  "button.cancel": "Annuler",
+  "config.api_keys_saved": "Clés API sauvegardées",
+  "config.link_copied": "Lien copié !",
+  "config.link_created": "Lien créé !",
+  "config.no_keys": "Aucune clé à sauvegarder",
+  "config.reindex_error": "Erreur de réindexation",
+  "config.save_error": "Erreur de sauvegarde",
+  "config.settings_saved": "✓ Paramètres sauvegardés",
+  "config.share_revoked": "Partage révoqué",
+  "config.url_required": "URL requise",
+  "dashboard.conflict_resolved": "Conflit résolu",
+  "dashboard.pin_error": "Erreur lors de l'épinglage",
+  "dragdrop.cross_vault_unsupported": "Cross-vault moves are not supported",
+  "dragdrop.move_failed": "Move failed",
+  "error.initialization": "Erreur lors de l'initialisation",
+  "offline.all_synced": "Toutes les modifications ont été synchronisées",
+  "offline.mode_offline": "Mode hors-ligne — vos modifications seront synchronisées au retour",
+  "offline.reconnected": "Connexion rétablie — synchronisation en cours...",
+  "search.saved": "Recherche sauvegardée",
+  "sync.index_reloaded": "Index complet rechargé",
+  "sync.install_success": "ObsiGate installé avec succès !",
+  "toast.dir_renamed": "Dossier renommé",
+  "toast.file_deleted": "Fichier supprimé",
+  "toast.file_renamed": "Fichier renommé",
+  "ui.cannot_rename": "Impossible de renommer cet élément",
+  "ui.element_not_found": "Élément introuvable dans l'arborescence",
+  "viewer.copy_error": "Erreur lors de la copie",
+  "viewer.loaded_from_cache": "Fichier chargé depuis le cache hors-ligne",
+  "ai.not_configured": "⚠️ AI non configuré — ajouter DEEPSEEK_API_KEY, OPENROUTER_API_KEY ou GEMINI_API_KEY dans .env",
+  "ai.inline_completion_title": "AI Inline Completion (Ctrl+J) — Complète le texte automatiquement",
+  "ai.rewrite": "💬 Réécrire",
+  "ai.rewrite_title": "Réécrit le texte selon vos instructions",
+  "auth.logout_title": "Déconnexion",
+  "config.reindexing": "Réindexation...",
+  "config.force_reindex": "Forcer réindexation",
+  "search.previous": "← Précédent",
+  "viewer.copied": "Copié !",
+  "viewer.shared_doc_title": "Document partagé — cliquer pour gérer"
+}