documentation in others languages

[titimoby]

First, thanks for the micropython port to microbit boards. I use it with kids in workshops and they like it very much. But it's a hard for the younger ones to follow an english documentation. I had a look to the documentation and it is not so complex to generate it but I didn't get how to handle several languages. Is there a plan for this and then we can contribute?

[deshipu]

See #371