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/en.json

@@ -607,14 +607,14 @@
   "dashboard.shared_hint": "Share a document to see it appear here",
   "dashboard.quick_help": "Quick Help",
   "dashboard.ctrl_hover_tip": "Hover over a document with Ctrl for a quick preview. Click Forge in the toolbar for the advanced editor.",
-  "settings.search": "Search",
-  "settings.backend": "Backend",
-  "settings.sync": "Sync",
-  "settings.diagnostics": "Diagnostics",
-  "settings.ai": "AI",
-  "settings.profile": "Profile",
-  "settings.about": "About",
-  "settings.themes": "Themes",
+  "settings.search": "🔍 Search",
+  "settings.backend": "⚙️ Backend",
+  "settings.sync": "🔄 Sync",
+  "settings.diagnostics": "🩺 Diagnostics",
+  "settings.ai": "🤖 AI",
+  "settings.profile": "👤 Profile",
+  "settings.about": "📦 About",
+  "settings.themes": "🎨 Themes",
   "settings.search_placeholder": "Search...",
   "settings.client_label": "These settings apply immediately on the client side.",
   "settings.history_section": "Recent History",
@@ -626,24 +626,24 @@
   "settings.history_count_desc": "Between 5 and 100 files (saved on server)",
   "settings.save": "Save",
   "settings.reindex": "Force reindex",
-  "help.nav_intro": "Introduction",
-  "help.nav_interface": "Interface",
-  "help.nav_navigation": "Navigation",
-  "help.nav_tabs": "Tabs",
-  "help.nav_search": "Search",
-  "help.nav_tags": "Tags",
-  "help.nav_files": "Files",
-  "help.nav_editing": "Editing",
-  "help.nav_graph": "Graph",
-  "help.nav_ai": "AI Editor",
-  "help.nav_palette": "Palette",
-  "help.nav_shortcuts": "Shortcuts",
-  "help.nav_sharing": "Sharing",
-  "help.nav_webhooks": "Webhooks",
-  "help.nav_backups": "Backups",
-  "help.nav_security": "Security",
-  "help.nav_customization": "Customization",
-  "help.nav_tips": "Tips",
+  "help.nav_intro": "📘 Introduction",
+  "help.nav_interface": "🧭 Interface",
+  "help.nav_navigation": "🗺️ Navigation",
+  "help.nav_tabs": "📑 Tabs",
+  "help.nav_search": "🔍 Search",
+  "help.nav_tags": "🏷️ Tags",
+  "help.nav_files": "📁 Files",
+  "help.nav_editing": "✏️ Editing",
+  "help.nav_graph": "🗺️ Graph",
+  "help.nav_ai": "🤖 AI Editor",
+  "help.nav_palette": "⌨️ Palette",
+  "help.nav_shortcuts": "⌨️ Shortcuts",
+  "help.nav_sharing": "🔗 Sharing",
+  "help.nav_webhooks": "🪝 Webhooks",
+  "help.nav_backups": "💾 Backups",
+  "help.nav_security": "🛡️ Security",
+  "help.nav_customization": "🎨 Customization",
+  "help.nav_tips": "💡 Tips",
   "help.search_placeholder": "Search help...",
   "help.toc_title": "CONTENTS",
   "help.welcome_title": "Welcome to ObsiGate",
@@ -740,5 +740,12 @@
   "auto.3be698f6": "Favor operators",
   "auto.b86ba5ea": "Multi-criteria search",
   "auto.4fa5d7c2": "Quick editing",
-  "auto.79f6e1dd": "Multi-window"
+  "auto.79f6e1dd": "Multi-window",
+  "admin.col_user": "User",
+  "admin.col_role": "Role",
+  "admin.col_vaults": "Vaults",
+  "admin.col_status": "Status",
+  "admin.col_last_login": "Last login",
+  "admin.col_actions": "Actions",
+  "common.never": "Never"
 }