Since recent beta you can write different messages to players based on their copy language. E.g.
Code:
private string GetLocalizedMessage(string lang, string key)
{
switch(key)
{
case "Hello":
{
switch (lang)
{
case "ru": return "Привет!";
case "en": return "Hello!";
case "turtle": return "Cawabanga dude!";
}
} break;
}
return String.Empty;
}