how to force asp.net MVC to remove its query string, Resources included in project

Question

I'm working on multi language web site. it works fine. but I need some changes in the URL which it creates.

My Resouces files are in App Global Resources Forlder named like this: lang.resx , lang.ja.resx , lang.fr.resx

here is my Route Config

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace ML_VoiceRecorderFree1
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",
                url: "{country_code}/{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional, country_code="" }
            );
        }
    }
}

and the url whch it creates is this : www.example.com/JP?language=jp and I need this to be like www.example.com/JP

what changes should I do? Appreciate any help. and also here is my controller if needed:

  public async Task<ActionResult> Index(string language)
    {
    if (String.IsNullOrWhiteSpace(language) == false)
    {

        Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(language);
        Thread.CurrentThread.CurrentUICulture = new CultureInfo(language);
    }
    else if (String.IsNullOrWhiteSpace(language))
    {
        try
        {
            //string userIpAddress = this.Request.UserHostAddress;
            string userIpAddress = "202.218.119.10";

            var client = new HttpClient
            {
                BaseAddress = new Uri("http://freegeoip.net/xml/")
            };

            var response = await client.GetAsync(userIpAddress);

            var content = await response.Content.ReadAsStringAsync();

            var result = (Response)new XmlSerializer(typeof(Response)).Deserialize(new StringReader(content));
            var country_name = result.CountryName;
            var country_code = result.CountryCode;
            TempData["Country_code"] = country_code;
            TempData["Country_name"] = country_name;

            if (country_code == "FR")
            {
                language = "fr-FR";

                Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(language);
                Thread.CurrentThread.CurrentUICulture = new CultureInfo(language);
                return RedirectToAction("Index", new { language = language, country_code = country_code });
            }
            else if (country_code == "JP")
            {
                language = "ja";

                Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(language);
                Thread.CurrentThread.CurrentUICulture = new CultureInfo(language);
                return RedirectToAction("Index", new { language = language, country_code = country_code });
            }
            else
            {
                language = "en";

                Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(language);
                Thread.CurrentThread.CurrentUICulture = new CultureInfo(language);
                return RedirectToAction("Index", new { language = language, country_code = country_code });

            }


        }
        catch
        {

            language = "en";

            Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(language);
            Thread.CurrentThread.CurrentUICulture = new CultureInfo(language);
            return RedirectToAction("Index", new { language = language });
        }
    }

    // do stuff
    return View();


}