Replace hardcoded French strings with i18n calls

Initialize i18n before auth so t() works when rendering
auth-dependent UI, and build the command palette lazily so
translations are loaded first. Bump service worker cache version.

frontend/js/viewer.js

@@ -499,7 +499,7 @@ export function renderFile(data) {
   const sourceBtn = el("button", { class: "btn-action", title: "Voir la source" }, [icon("code", 14), document.createTextNode("Source")]);
 
   // MD download button
-  const mdBtn = el("button", { class: "btn-action", title: "Télécharger en .md" }, [icon("file-text", 14), document.createTextNode(".md")]);
+  const mdBtn = el("button", { class: "btn-action", title: t("viewer.download_md") }, [icon("file-text", 14), document.createTextNode(".md")]);
   mdBtn.addEventListener("click", () => {
     const dlUrl = `/api/file/${encodeURIComponent(data.vault)}/download?path=${encodeURIComponent(data.path)}`;
     const a = document.createElement("a");
@@ -511,7 +511,7 @@ export function renderFile(data) {
   });
 
   // PDF download button
-  const pdfBtn = el("button", { class: "btn-action", title: "Télécharger en PDF" }, [icon("file", 14), document.createTextNode("PDF")]);
+  const pdfBtn = el("button", { class: "btn-action", title: t("viewer.download_pdf") }, [icon("file", 14), document.createTextNode("PDF")]);
   pdfBtn.addEventListener("click", () => {
     const pdfUrl = `/api/file/${encodeURIComponent(data.vault)}/pdf?path=${encodeURIComponent(data.path)}`;
     window.open(pdfUrl, "_blank");
@@ -522,7 +522,7 @@ export function renderFile(data) {
     openEditor(data.vault, data.path);
   });
 
-  const forgeBtn = el("button", { class: "btn-action btn-forge", title: "Forge (nouvel editeur)" }, [icon("hammer", 14), document.createTextNode("Forge")]);
+  const forgeBtn = el("button", { class: "btn-action btn-forge", title: t("viewer.forge_title") }, [icon("hammer", 14), document.createTextNode("Forge")]);
   forgeBtn.addEventListener("click", () => {
     var modal = document.getElementById("editor-modal");
     var container = modal.querySelector(".editor-container");
@@ -534,7 +534,7 @@ export function renderFile(data) {
     var brand = modal.querySelector(".editor-brand");
     var titleInp = document.getElementById("editor-title-input");
     var fileInp = document.getElementById("editor-filename-input");
-    if (brand) brand.textContent = "Forge";
+    if (brand) brand.textContent = t("viewer.forge_brand");
     if (titleInp) { titleInp.value = data.title || ''; titleInp.placeholder = t('forge.title_placeholder'); }
     if (fileInp) fileInp.value = data.path.split('/').pop();
     bodyEl.innerHTML = "";
@@ -574,14 +574,14 @@ export function renderFile(data) {
   shareBtn.addEventListener("click", () => openShareDialog(data.vault, data.path));
 
   // Bookmark button — check if already bookmarked
-  const bookmarkBtn = el("button", { class: "btn-action btn-bookmark", title: "Ajouter/Retirer des bookmarks" }, [icon("bookmark-plus", 14), document.createTextNode("Bookmark")]);
+  const bookmarkBtn = el("button", { class: "btn-action btn-bookmark", title: t("viewer.bookmark_toggle") }, [icon("bookmark-plus", 14), document.createTextNode("Bookmark")]);
   // Check bookmark status and color the button
   (async () => {
     try {
       const bms = await api("/api/bookmarks");
       if (Array.isArray(bms) && bms.some(b => b.vault === data.vault && b.path === data.path)) {
         bookmarkBtn.classList.add("active");
-        bookmarkBtn.title = "Retirer des bookmarks";
+        bookmarkBtn.title = t("viewer.bookmark_remove");
       }
     } catch (e) { /* ignore */ }
   })();
@@ -589,7 +589,7 @@ export function renderFile(data) {
     try {
       const res = await api("/api/bookmarks/toggle", { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ vault: data.vault, path: data.path, title: data.title }) });
       bookmarkBtn.classList.toggle("active", res.bookmarked);
-      bookmarkBtn.title = res.bookmarked ? "Retirer des bookmarks" : "Ajouter aux bookmarks";
+      bookmarkBtn.title = res.bookmarked ? t("viewer.bookmark_remove") : t("viewer.bookmark_add");
       showToast(res.bookmarked ? "Ajouté aux bookmarks" : "Retiré des bookmarks", "success");
       if (typeof DashboardBookmarkWidget !== "undefined") DashboardBookmarkWidget.load();
     } catch (err) { showToast("Erreur: " + err.message, "error"); }
@@ -1351,7 +1351,7 @@ const IndexUpdateManager = (() => {
       disconnected: "Déconnecté",
       connecting: "Connexion...",
       connected: "Synchronisé",
-      syncing: "Mise à jour...",
+      syncing: t("viewer.syncing"),
     };
     badge.title = labels[connectionState] || connectionState;
   }
@@ -1444,12 +1444,12 @@ function _renderSyncPanel(panel) {
     events.slice(0, 10).forEach((ev) => {
       const time = new Date(ev.timestamp).toLocaleTimeString();
       const typeLabels = {
-        index_updated: "Mise à jour",
+        index_updated: t("viewer.index_updated"),
         index_reloaded: "Rechargement",
-        vault_added: "Vault ajouté",
-        vault_removed: "Vault supprimé",
-        index_start: "Démarrage index.",
-        index_progress: "Vault indexé",
+        vault_added: t("sync.vault_added_label"),
+        vault_removed: t("sync.vault_removed_label"),
+        index_start: t("viewer.index_start"),
+        index_progress: t("sync.vault_indexed_label"),
         index_complete: "Indexation tech.",
       };
       const label = typeLabels[ev.type] || ev.type;