feat(notifications): implement notification system with CRUD operations and UI integration

src/i18n/en.json

@@ -33,7 +33,9 @@
     "changeTheme": "Change theme",
     "navigation": "Navigation",
     "calendar": "Calendar",
-    "federation": "Invitations"
+    "federation": "Invitations",
+    "imprint": "Imprint",
+    "privacy": "Privacy Policy"
   },
   "auth": {
     "login": "Sign in",
@@ -356,7 +358,23 @@
     "inviteExpired": "Expired",
     "inviteUsedBy": "Used by",
     "inviteExpiresAt": "Expires",
-    "noInvites": "No invitations yet"
+    "noInvites": "No invitations yet",
+    "legalLinksTitle": "Legal Links",
+    "legalLinksDesc": "Show Imprint and Privacy Policy links at the bottom of the sidebar. Leave blank to hide.",
+    "imprintUrl": "Imprint URL",
+    "privacyUrl": "Privacy Policy URL",
+    "imprintUrlSaved": "Imprint URL saved",
+    "privacyUrlSaved": "Privacy Policy URL saved",
+    "imprintUrlFailed": "Could not save Imprint URL",
+    "privacyUrlFailed": "Could not save Privacy Policy URL"
+  },
+  "notifications": {
+    "bell": "Notifications",
+    "markAllRead": "Mark all as read",
+    "noNotifications": "No notifications yet",
+    "roomShareAdded": "Room shared with you",
+    "roomShareRemoved": "Room access removed",
+    "federationInviteReceived": "New meeting invitation"
   },
   "federation": {
     "inbox": "Invitations",