fix: admin table i18n + emoji preservation in nav items

- Admin panel: table headers, data values, date locale-aware
- Settings/help nav: emojis added to locale values (🔍🔧🔄 etc.)
- auth.js: getLocale import, t() for all user-facing strings
- Added common.never + 6 admin column keys
- 746 locale keys per language

frontend/locales/fr.json

@@ -607,14 +607,14 @@
   "dashboard.shared_hint": "Partagez un document pour le voir apparaître ici",
   "dashboard.quick_help": "Raccourcis & Astuces",
   "dashboard.ctrl_hover_tip": "Survolez un document avec Ctrl pour un aperçu rapide. Cliquez sur Forge dans la barre d'outils pour l'éditeur avancé.",
-  "settings.search": "Recherche",
-  "settings.backend": "Backend",
-  "settings.sync": "Synchronisation",
-  "settings.diagnostics": "Diagnostics",
-  "settings.ai": "IA",
-  "settings.profile": "Profil",
-  "settings.about": "À propos",
-  "settings.themes": "Thèmes",
+  "settings.search": "🔍 Recherche",
+  "settings.backend": "⚙️ Backend",
+  "settings.sync": "🔄 Synchronisation",
+  "settings.diagnostics": "🩺 Diagnostics",
+  "settings.ai": "🤖 IA",
+  "settings.profile": "👤 Profil",
+  "settings.about": "📦 À propos",
+  "settings.themes": "🎨 Thèmes",
   "settings.search_placeholder": "Rechercher...",
   "settings.client_label": "Ces paramètres s'appliquent immédiatement côté client.",
   "settings.history_section": "Historique récent",
@@ -626,24 +626,24 @@
   "settings.history_count_desc": "Entre 5 et 100 fichiers (sauvegarde sur le serveur)",
   "settings.save": "Sauvegarder",
   "settings.reindex": "Forcer réindexation",
-  "help.nav_intro": "Introduction",
-  "help.nav_interface": "Interface",
-  "help.nav_navigation": "Navigation",
-  "help.nav_tabs": "Onglets",
-  "help.nav_search": "Recherche",
-  "help.nav_tags": "Tags",
-  "help.nav_files": "Fichiers",
-  "help.nav_editing": "Édition",
-  "help.nav_graph": "Graphe",
-  "help.nav_ai": "IA Éditeur",
-  "help.nav_palette": "Palette",
-  "help.nav_shortcuts": "Raccourcis",
-  "help.nav_sharing": "Partage",
-  "help.nav_webhooks": "Webhooks",
-  "help.nav_backups": "Sauvegardes",
-  "help.nav_security": "Sécurité",
-  "help.nav_customization": "Personnalisation",
-  "help.nav_tips": "Astuces",
+  "help.nav_intro": "📘 Introduction",
+  "help.nav_interface": "🧭 Interface",
+  "help.nav_navigation": "🗺️ Navigation",
+  "help.nav_tabs": "📑 Onglets",
+  "help.nav_search": "🔍 Recherche",
+  "help.nav_tags": "🏷️ Tags",
+  "help.nav_files": "📁 Fichiers",
+  "help.nav_editing": "✏️ Édition",
+  "help.nav_graph": "🗺️ Graphe",
+  "help.nav_ai": "🤖 IA Éditeur",
+  "help.nav_palette": "⌨️ Palette",
+  "help.nav_shortcuts": "⌨️ Raccourcis",
+  "help.nav_sharing": "🔗 Partage",
+  "help.nav_webhooks": "🪝 Webhooks",
+  "help.nav_backups": "💾 Sauvegardes",
+  "help.nav_security": "🛡️ Sécurité",
+  "help.nav_customization": "🎨 Personnalisation",
+  "help.nav_tips": "💡 Astuces",
   "help.search_placeholder": "Rechercher dans l'aide...",
   "help.toc_title": "SOMMAIRE",
   "help.welcome_title": "Bienvenue dans ObsiGate",
@@ -740,5 +740,12 @@
   "auto.3be698f6": "Favorisez les opérateurs",
   "auto.b86ba5ea": "Recherche multi-critères",
   "auto.4fa5d7c2": "Édition rapide",
-  "auto.79f6e1dd": "Multi-fenêtres"
+  "auto.79f6e1dd": "Multi-fenêtres",
+  "admin.col_user": "Utilisateur",
+  "admin.col_role": "Rôle",
+  "admin.col_vaults": "Vaults",
+  "admin.col_status": "Statut",
+  "admin.col_last_login": "Dernière connexion",
+  "admin.col_actions": "Actions",
+  "common.never": "Jamais"
 }