Xamarin Auth0Client with support for lang in widget

CustomAuth0Client.cs

using System.Reflection;
using Xamarin.Auth;

public class CustomAuth0Client : Auth0.SDK.Auth0Client {
  private const string AuthorizeUrl = "https://{0}/authorize?client_id={1}&redirect_uri={2}&response_type=token&connection={3}&scope={4}";
  private const string LoginWidgetUrl = "https://{0}/login/?client={1}&redirect_uri={2}&response_type=token&scope={3}";
  
  private readonly string domain;
  private readonly string clientId
  
  public CustomAuth0Client (string domain, string clientId) : base(domain, clientId){
    this.domain = domain;
    this.clientId = clientId;
  }
  
  protected override WebRedirectAuthenticator GetAuthenticator(string connection, string scope)
    {
      // Generate state to include in startUri
      var chars = new char[16];
      var rand = new Random ();
      for (var i = 0; i < chars.Length; i++) {
        chars [i] = (char)rand.Next ((int)'a', (int)'z' + 1);
      }
      
      var redirectUri = this.CallbackUrl;
      var authorizeUri = !string.IsNullOrWhiteSpace (connection) ?
        string.Format(AuthorizeUrl, this.domain, this.clientId, Uri.EscapeDataString(redirectUri), connection, scope) :
        string.Format(LoginWidgetUrl, this.domain, this.clientId, Uri.EscapeDataString(redirectUri), scope);

      var state = new string (chars);
      // begin code change
      var partialStartUrl = authorizeUri + "&state=" + state;
      partialStartUrl += "&lang=" + GetLanguage();
      var startUri = new Uri (partialStartUrl);

      // end code change
      var endUri = new Uri (redirectUri);

      var auth = new WebRedirectAuthenticator (startUri, endUri);
      auth.ClearCookiesBeforeLogin = false;

      return auth;
    }

    private string GetLanguage(){
      // logic to retrieve language
    }
}