Oh ok. Obviously we have a problem with JoomlaComment then
Unfortunately I think we will have to wait for Daniel on this, language and character conversion is something I know little about
Plus I only work on JoomlaComment4.
I actually do remember that a user was having the same question marks ???? problem with Russian language (or something that uses Crylic letters) but I think that was JC4. Anyway, you may have to wait a while until Daniel can attend to this. Or upgrade to JC4 and then I could help