partial class Examples
{
  public static Result DetermineCurrentLanguage(RhinoDoc doc)
  {
    var language_id = Rhino.ApplicationSettings.AppearanceSettings.LanguageIdentifier;
    var culture = new System.Globalization.CultureInfo(language_id);
    RhinoApp.WriteLine("The current language is {0}", culture.EnglishName);
    return Result.Success;
  }
}

import rhinoscriptsyntax as rs
import System

locale_id = rs.LocaleID()
culture = System.Globalization.CultureInfo(locale_id)
print(culture.EnglishName)