It's a good day to use UserVoice no matter where you are! Today we published Spanish (Argentina) and Catalan translations of both the end-user-facing and Admin-facing interfaces, and it's all thanks to the dedicated efforts of our community! You can see a full list of translations (as well as help out yourself) at translate.uservoice.com.
Keep the great translations coming and be sure to let us know if there's a language you'd like to see supported!
Associate Community Manager, UserVoice