Globalization does not work after publishing to store

Question

Hi,

I am building a multilingual WP 8.1 app

After having my app tested on the emulator and my device the globalization worked correctly, but when I publish the app to the store, the app does not switch between the languages??

below is the code that I built to switch between the languages:

 public static ResourceLoader loader
        {
            get
            {
                if (!string.IsNullOrEmpty(DB.Lang))
                {var culture = new CultureInfo(DB.Lang);
                    Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride = culture.Name;
                    CultureInfo.DefaultThreadCurrentCulture = culture;
                    CultureInfo.DefaultThreadCurrentUICulture = culture;
                    return new ResourceLoader();}
                return _loader;
            }
            set
            {
                if (value != null)
                    _loader = value;
            }
        }

the 'loader' is a static variable inside 'UIHelper' class I use to get the localized strings as follows:

UIHelper.loader.GetString("ErrorIdMissing");

Please help!!