Offray,
¿Theres is somekind of documentation for the use of Babel? I have read about po4a[1] (Po for anything) and may be it could give support for translation of text in Squeak "documents". I have working previously on translation of documentation and the problems on having craft hand made translation as stated in the po4a document are great and will be nice if we try to avoid them from the beginning.
LanguageEditor in Squeak usually works ok. There are always some glitches. Beware of that. As for the documentation, I believe Diego (the original author of Babel and LanguageEditor) has something in Spanish.
Pdt: I was reading a Book on Squeak and OLPC in the last etoys image, but seems incomplete. This is an ongoing work or the writing its already done, somewhere?
What is the "Book"? The Demon Castle tutorial? If so, there are (now broken) sequels available at: http://tinlizzie.org/olpc/tutorial/
-- Yoshiki