Hilaire,
With the latest squeak-dev image, I try to load an updated fr.translation file from http://squeak.ofset.org/traduction/fr.translation, then I got the error message in the picture bellow.
Yes, LanguageEditor and NaturalLanguageTranslater had many problems (still does) but the fixes only made to the OLPC image (and some to Squeakland image)...
-- Yoshiki