Add integration test for change language

Signed-off-by: dab246 <tdvu@linagora.com>

integration_test/robots/setting_robot.dart

@@ -0,0 +1,11 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import '../base/core_robot.dart';
+
+class SettingRobot extends CoreRobot {
+  SettingRobot(super.$);
+
+  Future<void> openLanguageMenuItem() async {
+    await $(#setting_language_region).tap();
+  }
+}