Future<void> changeLanguage() async {
  return showDialog<void>(
    context: context,
    barrierDismissible: false,
    builder: (BuildContext context) {
      return CupertinoAlertDialog(
        content: SingleChildScrollView(
          child: ListBody(
            children: <Widget>[
              Text(
                'set_app_language'.tr(),
                style: const TextStyle(
                  fontWeight: FontWeight.bold,
                  fontSize: 14,
                ),
              ),
              const SizedBox(height: 8),
              Text('app_language_title'.tr()),
              const SizedBox(height: 16),
              Text('app_language_body'.tr()),
            ],
          ),
        ),
        actions: <Widget>[
          CupertinoDialogAction(
            isDefaultAction: true,
            child: Text('open_settings'.tr()),
            onPressed: () {
              openAppSettings();
            },
          ),
          CupertinoDialogAction(
            child: Text(
              'cancel'.tr(),
            ),
            onPressed: () async {
              Navigator.of(context).pop();
            },
          ),
        ],
      );
    },
  );
}