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/ui.js

@@ -1701,9 +1701,9 @@ export const ContextMenuManager = {
       this._addItem('edit', 'Renommer', () => this._renameItem(), isReadonly);
       this._addItem('trash-2', 'Supprimer', () => this._deleteFile(), isReadonly);
       this._addSeparator();
-      this._addItem('bookmark-plus', 'Ajouter aux bookmarks', () => this._toggleBookmark(), false);
+      this._addItem('bookmark-plus', t("viewer.bookmark_add"), () => this._toggleBookmark(), false);
       this._addSeparator();
-      this._addItem('history', 'Backups / Versions', () => this._openBackupViewer(), false);
+      this._addItem('history', t("ui.backups_versions"), () => this._openBackupViewer(), false);
     }
 
     this._menu.classList.add('active');
@@ -1750,7 +1750,7 @@ export const ContextMenuManager = {
         callback();
       });
     } else {
-      item.title = 'Vault en lecture seule';
+      item.title = t("ui.vault_readonly");
     }
     
     this._menu.appendChild(item);