Add integration test for change language

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

lib/features/mailbox/presentation/widgets/mailbox_app_bar.dart

@@ -49,6 +49,7 @@ class MailboxAppBar extends StatelessWidget {
               onTapAction: openAppGridAction!,
             ),
           UserAvatarBuilder(
+            key: const Key('user_avatar'),
             username: username.firstLetterToUpperCase,
             padding: const EdgeInsetsDirectional.only(start: 4),
             onTapAction: openSettingsAction,

lib/features/manage_account/presentation/language_and_region/language_and_region_controller.dart

@@ -88,6 +88,7 @@ class LanguageAndRegionController extends BaseController {
     }).toList();
 
     openBottomSheetContextMenuAction(
+      key: const Key('language_context_menu'),
       context: context,
       itemActions: contextMenuActions,
       onContextMenuActionClick: (menuAction) {

lib/features/manage_account/presentation/language_and_region/widgets/change_language_button_widget.dart

@@ -132,6 +132,7 @@ class _ChangeLanguageButtonWidgetState extends State<ChangeLanguageButtonWidget>
 
   Widget _buildMobileLanguageMenu(BuildContext context) {
     return Obx(() => TMailDropDownWidget(
+      key: const Key('language_drop_down_button'),
       text: _languageAndRegionController
           .languageSelected
           .value

lib/features/manage_account/presentation/menu/settings/settings_first_level_view.dart

@@ -17,6 +17,7 @@ class SettingsFirstLevelView extends GetWidget<SettingsController> {
   @override
   Widget build(BuildContext context) {
     return SingleChildScrollView(
+      key: const Key('setting_menu'),
       child: Column(children: [
         Obx(() => UserInformationWidget(
           userName: controller.manageAccountDashboardController.accountId.value != null
@@ -141,6 +142,7 @@ class SettingsFirstLevelView extends GetWidget<SettingsController> {
               endIndent: SettingsUtils.getHorizontalPadding(context, controller.responsiveUtils)
             ),
             SettingFirstLevelTileBuilder(
+              key: const Key('setting_language_region'),
               AccountMenuItem.languageAndRegion.getName(AppLocalizations.of(context)),
               AccountMenuItem.languageAndRegion.getIcon(controller.imagePaths),
               () => controller.selectSettings(AccountMenuItem.languageAndRegion)