Added uniform loading indicator for all screens

lib/widget/loadingSpinner.dart

@@ -1,4 +1,6 @@
 
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
 class LoadingSpinner extends StatefulWidget {
@@ -9,21 +11,39 @@ class LoadingSpinner extends StatefulWidget {
 }
 
 class _LoadingSpinnerState extends State<LoadingSpinner> {
+  bool textVisible = false;
+  late Timer timer;
+
+  @override
+  void initState() {
+     timer = Timer(const Duration(seconds: 10), () {
+      setState(() {
+        textVisible = true;
+      });
+    });
+
+    super.initState();
+  }
+
   @override
   Widget build(BuildContext context) {
-    return Dialog(
-      child: Padding(
-        padding: const EdgeInsets.all(20),
-        child: Row(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            CircularProgressIndicator(
-              color: Theme.of(context).primaryColor,
-            ),
-            const Padding(padding: EdgeInsets.only(left: 15), child: Text("Daten abrufen...")),
-          ],
-        ),
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          const CircularProgressIndicator(),
+          Visibility(
+            visible: textVisible,
+            child: const Text("Bist du mit dem Internet verbunden?"),
+          ),
+        ],
       ),
     );
   }
+
+  @override
+  void dispose() {
+    timer.cancel();
+    super.dispose();
+  }
 }