feat(i18n): Többnyelvűség alapjainak beállítása és UI takarítás

frontend/src/i18n/en.ts

@@ -0,0 +1,29 @@
+export default {
+  menu: {
+    features: 'Features',
+    garage: 'Vehicles',
+    calendar: 'Service Calendar',
+    finance: 'Finance & Costs',
+    diagnostic: 'Live Diagnostics',
+    addVehicle: '+ Add New Vehicle',
+  },
+  header: {
+    welcome: 'Welcome',
+    userMenu: 'User menu',
+    profile: 'Profile Settings',
+    logout: 'Logout',
+    subtitle: 'Your dashboard and vehicle overview',
+  },
+  dashboard: {
+    loading: 'Loading...',
+    errorRetry: 'Retry',
+    statusActive: 'Active',
+    statusUnknown: 'Unknown',
+    condition: 'Condition',
+    mileage: 'km',
+  },
+  zen: {
+    hide: 'Hide UI (Zen mode)',
+    show: 'Show UI',
+  },
+}