The language the user's operating system is running in.

You can use this to automatically pick a localization for your content based on the user's system language.

	// 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

public class Example(MonoBehaviour):

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