We have been contacted by lots of individuals who volunteered to translate Instantbird into their native language and were eager to start working on it. As we were not ready to host the translations, we asked people to wait before starting their work on localized versions of Instantbird.
As we plan to release the next beta of Instantbird 0.2 in several languages, we feel that now is a good time to start translating the UI of Instantbird. Please note that the development work is not finished yet, and that there will still be string changes before we are ready to release this next milestone.
You will find information on the translation process on our wiki at http://wiki.instantbird.org/Instantbird:Translation. As usual, if you have any question, feel free to ask them in #instantbird on irc.mozilla.org or to contact us at contact AT instantbird DOT org.