well, trumpcard or another of the devs would answer you better than i do, but you don't only need to recompile to make it work with a non us version.
when the client connects to the server, languages are checked and the server will allow the connection only if it detects a client set up in US. To make it work with your version, you ll have to modify the source code and prolly need some datas that aren't yet available (opcodes).
i hope i m right and clear enough
