// Prints to a guiText the actual language that the system is using.
    guiText.text = Application.systemLanguage.ToString();

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        guiText.text = Application.systemLanguage.ToString();
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        guiText.text = Application.systemLanguage.ToString()