public partial class MyDomainContext
     {
         partial void OnCreated()
         {
             if (DomainClient is WebDomainClient<IMyDomainServiceContract> domainClient)
             {
                 if (domainClient.ChannelFactory.Endpoint.Behaviors.All(b => b.GetType() != typeof(InjectCultureNameBehavior)))
                 {
                     domainClient.ChannelFactory.Endpoint.Behaviors.Add(InjectCultureNameBehavior);
                 }
             }
        }

        private static readonly InjectCultureNameBehavior InjectCultureNameBehavior = new InjectCultureNameBehavior();
     }

    internal class InjectCultureNameBehavior : WebHttpBehavior
    {
        public override void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
        {
            clientRuntime.MessageInspectors.Add(_inspector);
        }
    }

    internal class InjectCultureMessageInspector : IClientMessageInspector
    {
        public object BeforeSendRequest(ref Message request, IClientChannel channel)
        {
            var property = request.Properties[HttpRequestMessageProperty.Name] as HttpRequestMessageProperty;
            if (property != null && property.Method == "POST")
            {
                property.Headers["CultureName"] = Thread.CurrentThread.CurrentUICulture.Name;
            }

            return null;
        }

        public void AfterReceiveReply(ref Message reply, object correlationState)
        {
            
        }
    }

        protected void Application_AuthenticateRequest(object sender, EventArgs e)
        {
            if (System.Web.HttpContext.Current.Request.Headers.AllKeys.Any(k => k == "CultureName"))
                Thread.CurrentThread.CurrentUICulture = new CultureInfo(System.Web.HttpContext.Current.Request.Headers["CultureName"]);
        }