Kodial внес ясность. Теперь скрипты включают языки.
Вмето немецкого пока можно ставить английский текст, потом желающие переведут.

Код:
using System;
using System.Collections;
using System.Collections.Generic;
using maddox.game;
using maddox.game.world;


public class Mission : AMission
{

    private void sendScreenMessageTo(int army, string msg, object[] parms)
    {
        if (army != -1)
        {
            //Singleplayer (for Testing)
            if (GamePlay.gpRemotePlayers() == null || GamePlay.gpRemotePlayers().Length <= 0)
            {
                if (GamePlay.gpPlayer() != null && GamePlay.gpPlayer().Army() == army)
                    GamePlay.gpHUDLogCenter(null, msg, parms);

            }
            else // Multiplayer
            {
                List<Player> Players = new List<Player>();

                foreach (Player p in GamePlay.gpRemotePlayers())
                {
                    if (p.Army() == army)
                        Players.Add(p);
                }
                GamePlay.gpHUDLogCenter(Players.ToArray(), msg, parms);
            }
        }
        else GamePlay.gpHUDLogCenter(null, msg, parms);
    }


    private void sendChatMessageTo(int army, string msg, object[] parms)
    {
        if (army != -1)
        {
            //Singleplayer (for Testing)
            if (GamePlay.gpRemotePlayers() == null || GamePlay.gpRemotePlayers().Length <= 0)
            {
                if (GamePlay.gpPlayer() != null && GamePlay.gpPlayer().Army() == army)
                    GamePlay.gpLogServer(null, msg, parms);

            }
            else // Multiplayer
            {
                List<Player> Players = new List<Player>();

                foreach (Player p in GamePlay.gpRemotePlayers())
                {
                    if (p.Army() == army)
                        Players.Add(p);
                }
                GamePlay.gpLogServer(Players.ToArray(), msg, parms);
            }
        }
        else GamePlay.gpLogServer(null, msg, parms);
    }


    private void sendScreenMessageTo(int army, string playerlanguage, string msg, object[] parms)
    {
        if (army != -1)
        {
            //Singleplayer (for Testing)
            if (GamePlay.gpRemotePlayers() == null || GamePlay.gpRemotePlayers().Length <= 0)
            {
                if (GamePlay.gpPlayer() != null && GamePlay.gpPlayer().Army() == army && GamePlay.gpPlayer().LanguageName().Equals(playerlanguage))
                    GamePlay.gpHUDLogCenter(null, msg, parms);

            }
            else // Multiplayer
            {
                List<Player> Players = new List<Player>();

                foreach (Player p in GamePlay.gpRemotePlayers())
                {
                    if (p.Army() == army && p.LanguageName().Equals(playerlanguage))
                        Players.Add(p);
                }
                GamePlay.gpHUDLogCenter(Players.ToArray(), msg, parms);
            }
        }
        else GamePlay.gpHUDLogCenter(null, msg, parms);
    }


    private void sendChatMessageTo(int army, string playerlanguage, string msg, object[] parms)
    {
        if (army != -1)
        {
            //Singleplayer (for Testing)
            if (GamePlay.gpRemotePlayers() == null || GamePlay.gpRemotePlayers().Length <= 0)
            {
                if (GamePlay.gpPlayer() != null && GamePlay.gpPlayer().Army() == army && GamePlay.gpPlayer().LanguageName().Equals(playerlanguage))
                    GamePlay.gpLogServer(null, msg, parms);
            }
            else // Multiplayer
            {
                List<Player> Players = new List<Player>();

                foreach (Player p in GamePlay.gpRemotePlayers())
                {
                    if (p.Army() == army && p.LanguageName().Equals(playerlanguage))
                        Players.Add(p);
                }
                GamePlay.gpLogServer(Players.ToArray(), msg, parms);
            }
        }
        else GamePlay.gpLogServer(null, msg, parms);
    }


    public override void OnPlaceEnter(Player player, AiActor actor, int placeIndex)
    {
        base.OnPlaceEnter(player, actor, placeIndex);
       
        
        //test
        switch (player.LanguageName())
        {
            case "de":
                sendScreenMessageTo(2, "de", "Hallo!", null);
                break;
            case "ru":
                sendScreenMessageTo(2, "ru", "Привет!", null);
                break;
            default:
                sendScreenMessageTo(2, "Hello!", null);
                break;
        }
        
    }
}