SystemLanguage.Russian

Указывает, что язык операционной системы — русский.

using UnityEngine;

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