I've made a script that uses Altavista Babelfish engine to translate on the fly texts you send to your contacts.
Usage :
!translate brings up the GUI for translation
!translate lng1 lng2 text translate directly from lang1 to lang2
!translate info shows the info window, with language codes and stuff...
You can also access these commands and the about window by clicking on the MsgPlus! icon in one of your contact windows.
Please leave your suggestions here and report if you find some bugs.