Grab the latest data files here : http://www.gamefront.com/files/20991096/data1115.rar
Extract the two files into your wow/ folder.
Works on US clients, couldn't test on the others but should be fine.
When you log on a realm type "/join english
" to get in touch with the community members.
WoW English/Chinese glossary
(2000+ translated words) found on wow-in-chinese.jfs-web.chEnglish speakers are consolidating on the same realm for Cataclysm check this thread