Added hint which user is going to be signed out

lib/view/settings/settings.dart

@@ -45,8 +45,9 @@ class _SettingsState extends State<Settings> {
         body: ListView(
           children: [
             ListTile(
-              leading: const Icon(Icons.logout_outlined),
+              leading: const CenteredLeading(Icon(Icons.logout_outlined)),
               title: const Text("Konto abmelden"),
+              subtitle: Text("Angemeldet als ${AccountData().getUsername()}"),
               onTap: () {
                 showDialog(
                   context: context,