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/core/locales/lb.json

@@ -65,8 +65,16 @@
         "profile_updated": "Profil erfollegräich aktualiséiert"
     },
     "messages": {
-        "failed_to_load_dashboard_data": "Failed to load dashboard data",
-        "dashboard_refreshed": "Dashboard refreshed"
+        "failed_to_load_dashboard_data": "Dashboard-Donnéeë konnten net geluede ginn",
+        "dashboard_refreshed": "Dashboard aktualiséiert",
+        "item_removed_from_cart": "Artikel aus dem Kuerf ewechgeholl",
+        "cart_cleared": "Kuerf eidel gemaach"
+    },
+    "confirmations": {
+        "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?",
+        "reset_email_settings": "All E-Mail-Astellunge ginn op .env-Standardwäerter zréckgesat. Weidermaachen?",
+        "cleanup_logs": "All Protokoller, déi méi al wéi {days} Deeg sinn, ginn geläscht. Weidermaachen?"
     },
     "menu": {
         "dashboard": "Dashboard",