ASP.NET MVC: Creating localized DropDownLists for enums

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using System.Globalization;
using MvcEnumDropDownList.Infrastructure;
using System.Threading;

namespace MvcEnumDropDownList
{
	// Note: For instructions on enabling IIS6 or IIS7 classic mode, 
	// visit http://go.microsoft.com/?LinkId=9394801

	public class MvcApplication : System.Web.HttpApplication
	{
		public static void RegisterGlobalFilters(GlobalFilterCollection filters)
		{
			filters.Add(new HandleErrorAttribute());
		}

		public static void RegisterRoutes(RouteCollection routes)
		{
			routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

			routes.MapRoute(
				"Default", // Route name
				"{controller}/{action}/{id}", // URL with parameters
				new
				{
					controller = "Home",
					action = "Index",
					id = UrlParameter.Optional
				} // Parameter defaults
			);

		}

		protected void Application_Start()
		{
			AreaRegistration.RegisterAllAreas();

			RegisterGlobalFilters(GlobalFilters.Filters);
			RegisterRoutes(RouteTable.Routes);
		}

		protected void Application_AcquireRequestState(object sender, EventArgs e)
		{
			//It's important to check whether session object is ready
			if(HttpContext.Current.Session == null)
				return;

			CultureInfo ci = SessionHelper.Culture;

			//Checking first if there is no value in session 
			//and set default language 
			//this can happen for first user's request
			if(ci == null)
			{
				//Sets default culture to portuguese invariant
				string langName = "pt";

				//Try to get values from Accept lang HTTP header
				if(HttpContext.Current.Request.UserLanguages != null && HttpContext.Current.Request.UserLanguages.Length != 0)
				{
					//Gets accepted list 
					langName = HttpContext.Current.Request.UserLanguages[0].Substring(0, 2);
				}

				ci = new CultureInfo(langName);
				SessionHelper.Culture = ci;
			}

			//Finally setting culture for each request
			Thread.CurrentThread.CurrentUICulture = ci;
			Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(ci.Name);
		}
	}
}