Application.systemLanguage

Description

The language in which 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. Use Application.systemLanguage to find the value of this setting.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        //This checks if your computer's operating system is in the French language
        if (Application.systemLanguage == SystemLanguage.French)
        {
            //Outputs into console that the system is French
            Debug.Log("This system is in French. ");
        }
        //Otherwise, if the system is English, output the message in the console
        else if (Application.systemLanguage == SystemLanguage.English)
        {
            Debug.Log("This system is in English. ");
        }
    }
}

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        //This outputs what language your system is in
        Debug.Log("This system is in " + Application.systemLanguage);
    }
}