communicating between scripts doesnt work

Questions & Answers
1

using UnityEngine;
using System.Collections;

public class englishorpolish : MonoBehaviour
{
	void OnGUI ()
	{
		if (GUI.Button (new Rect ((Screen.width+50)/2, (Screen.height)/2,100,50), "Polski", GUI.skin.GetStyle ("button"))) 
		{
			head.language = 1;
			Application.LoadLevel("0. mainmenu");
		}
		if (GUI.Button (new Rect ((Screen.width-200)/2,(Screen.height)/2,100,50), "English", GUI.skin.GetStyle ("button"))) 
		{
			head.language =+ 1;
			Application.LoadLevel("0. mainmenu");
		}
	}

}

nothing happens in head’s script(it doesnt add anything). What I did wrong?

2

Language settings are one of the few places static actually makes sense. Assuming your game is to be played in a single language once the setting is chosen. If you have multiple different characters speaking different languages you need to use GetComponent.

Here is working code using static

using UnityEngine;
using System.Collections;
 
public class englishorpolish : MonoBehaviour {
    void OnGUI () {
        if (GUI.Button (new Rect ((Screen.width+50)/2, (Screen.height)/2,100,50), "Polski", GUI.skin.GetStyle ("button"))) {
            Head.language = 1;
        }
        if (GUI.Button (new Rect ((Screen.width-200)/2,(Screen.height)/2,100,50), "English", GUI.skin.GetStyle ("button"))) {
            Head.language = 2;
        }
    }
}

public class Head {
    public static int language;
}

Note: I strongly suspect your problem had nothing to do with accessing the variable, and everything to do with assigning it via +=. Your original code would increase the language by one. As ints default to zero I suspect both buttons were working but doing the dame thing.

Note: By convention class, struct and method names should start with a capital letter. Field, variable and property names start with a small letter. This will make it easier for others to read and assist.