Personally I hate translated games. So I will not translate them, and even if you do, people with different names may play the game in different languages even then.
But I have not even found the regular gaming spritefonts with none latin letters. so when people with thai names play the leaderboard name will just be blank for their inputs...
Any thai, persian, russian or korean game devs here who have been playing facebook games or similar and experienced this issue, that your names "do not show/work" in the game?