It is optional. The code stays in english. Good. Logical.
For any level programmer it is almost a 'must' to learn the english words present in the IDE. Not a big deal.
The real KICK would be anyone find find all the documentation in his own language, but that is complicated.
Also b4x would inflate and may be hard to find an answer (particularly if it is in another language).
Anyway count on me for Brazilian Portuguese translation
Dear Erel,
How long do you hope the community will have translated?
For my (french) part (if I work allone), I will need a dozen days to translate all items ...