This is actually a pretty neat program I made myself.
It allows you to inject multiple .DLL's into the World of Warcraft program, allowing intercepting of packets and the such.
I included a language hack as a test of what you can do. Much more is possible, however, but I leave the crafting of the other Dynamic Link Library files to you.
Enjoy.
NOTE: regkey.key, config.ini, LanguageHack.dll, and akjg8ek4.exe must ALL be in the same directory.
Directions: Run WoW, run akjg8ek4.exe, click inject.
http://www.megaupload.com/?d=F7IOBH2N