implement basic selections without functionality

lib/presentation/views/main_menu/settings_subpages/language_view.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+import 'package:game_tracker/core/custom_theme.dart';
+
+class LanguageView extends StatefulWidget {
+  const LanguageView({super.key});
+
+  @override
+  State<LanguageView> createState() => _LanguageViewState();
+}
+
+class _LanguageViewState extends State<LanguageView> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Sprache'), titleTextStyle: TextStyle(fontWeight: FontWeight.bold, fontSize: 20), centerTitle: true, backgroundColor: CustomTheme.backgroundColor),
+      backgroundColor: CustomTheme.backgroundColor,
+      body: Column(
+        children: [
+          ListTile(
+            title: Text("Systemstandard"),
+            leading: Radio(
+              value: Null,
+              groupValue: Null, 
+              onChanged: (value) {},
+            ),
+          ),
+          ListTile(
+            title: Text("Deutsch"),
+            leading: Radio(
+              value: Null,
+              groupValue: Null, 
+              onChanged: (value) {},
+            ),
+          ),
+          ListTile(
+            title: Text("Englisch"),
+            leading: Radio(
+              value: Null,
+              groupValue: Null, 
+              onChanged: (value) {},
+            ),
+          )
+        ],
+      ),
+    );
+  }
+}

lib/presentation/views/main_menu/settings_subpages/theme_view.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+import 'package:game_tracker/core/custom_theme.dart';
+
+class ThemeView extends StatefulWidget {
+  const ThemeView({super.key});
+
+  @override
+  State<ThemeView> createState() => _ThemeViewState();
+}
+
+class _ThemeViewState extends State<ThemeView> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Design'), titleTextStyle: TextStyle(fontWeight: FontWeight.bold, fontSize: 20), centerTitle: true, backgroundColor: CustomTheme.backgroundColor),
+      backgroundColor: CustomTheme.backgroundColor,
+      body: Column(
+        children: [
+          ListTile(
+            title: Text("Systemstandard"),
+            leading: Radio(
+              value: Null,
+              groupValue: Null, 
+              onChanged: (value) {},
+            ),
+          ),
+          ListTile(
+            title: Text("Dunkel"),
+            leading: Radio(
+              value: Null,
+              groupValue: Null, 
+              onChanged: (value) {},
+            ),
+          ),
+          ListTile(
+            title: Text("Hell"),
+            leading: Radio(
+              value: Null,
+              groupValue: Null, 
+              onChanged: (value) {},
+            ),
+          )
+        ],
+      ),
+    );
+  }
+}