On Windows 7 (x86) with my language support (French), no special character will display properly, nor in-game chat neither in server console and logs :
é è ê ë à â ä ù û ü ç ... and more are replaced with question marks (double "??" on chat, single on console).
I've also tried the language tool: same problem.
(also: automatic translations are painful to read
I could lend a hand on that I think)