fix(i18n): complete translations for production launch and fix CMS store context

- Replace CMS custom get_store_context() with core utility (same fix as loyalty)
- Add 85 missing translation keys across fr/de/lb for core, tenancy, messaging,
  customers, and loyalty modules
- Convert 21 client-side $t() calls to server-side _() in 9 loyalty templates
- Fix 3 broken translation keys in store/cards.html

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/tenancy/locales/lb.json

@@ -90,6 +90,13 @@
         "failed_to_load_user": "Failed to load user",
         "user_updated_successfully": "User updated successfully"
     },
+    "confirmations": {
+        "enable_all_modules": "All Moduler ginn aktivéiert. Weidermaachen?",
+        "disable_optional_modules": "All optional Moduler ginn deaktivéiert, nëmmen Kärmoduler bleiwen aktiv. Weidermaachen?",
+        "reset_theme": "Theme op Standard zrécksetzen? Dëst kann net réckgängeg gemaach ginn.",
+        "show_all_menu_items": "All Menüpunkten ginn ugewisen. Weidermaachen?",
+        "hide_all_menu_items": "All Menüpunkten ginn verstopp (ausser obligatoresch). Dir kënnt dann déi gewënscht aktivéieren. Weidermaachen?"
+    },
     "features": {
         "team_members": {
             "name": "Team-Memberen",