♻️(frontend) restore User Information in Settings Dialog

Reintroduced user information in the settings dialog. This change allows
users to see the account they are logged into, which is important for
account management. An additional feature to update usernames will be
added soon. Apologies to @manuhabitela for the oversight.

src/frontend/src/locales/de/settings.json

@@ -1,4 +1,9 @@
 {
+  "account": {
+    "currentlyLoggedAs": "",
+    "heading": "",
+    "youAreNotLoggedIn": ""
+  },
   "dialog": {
     "heading": ""
   },