Change the locale in CefSharp.Wp

Using CefSharp.Wpf, you are creating a WPF application that displays web pages.
I tried to change the CefSharp Locale to Japanese, and I set it to Locale and LocalesDirPath in CefSettings as follows, but I cannot change it to the default en-US.

CefSettings settings=newCefSettings();
settings.Locale="ja-JP";
settings.LocalesDirPath=System.AppDomain.CurrentDomain.BaseDirectory+"locales";

Also, I tried to add Accept-Language to Header by referring to the following site, but when I checked the contents of Header after adding it, Accept-Language was not added to Header.

https://github.com/cefsharp/CefSharp/issues/231

public CefReturnValue OnBeforeResourceLoad (IWebBrowser browser, IRrequest request, pool isMainFrame)
{
    request.Headers.Add("Accept-Language", "ja-JP";
    for (inti=0;i<request.Headers.Count;i++)
    {
        // Accept-Language settings are not included
        Console.WriteLine(request.Headers[i].ToString());
    }
    return CefReturnValue.Continue;
}

CefSharp.Wpf is using version 41 from NuGet in Visual Studio 2015.
The operating system is Windows 8.1 64-bit.
If anyone understands, please take good care of me.

Add

I checked CefSharp's latest CefSettings.h and found that

virtual property String^AcceptLanguageList

was added.CefSharp of V41.0.0 obtained from NuGet has not been implemented yet, so it has not been verified to work, but I think that setting this up will probably change the locale.