TranslateExtension.cs

namespace WhiteLabelingXFSample.Resources
{
    [ContentProperty("Text")]
    public class TranslateExtension : IMarkupExtension
    {
        static string ResourceId = WhiteLabelingConfig.Instance.AppResourceFile;

        public string Text { get; set; }

        public object ProvideValue(IServiceProvider serviceProvider)
        {
            if (Text == null)
                return null;

            return GetValue(Text);
        }

        public static string GetValue(string text)
        {
            ResourceManager resourceManager = new ResourceManager(ResourceId, typeof(TranslateExtension).GetTypeInfo().Assembly);
            return resourceManager.GetString(text, CultureInfo.CurrentCulture);
        }
    }
}