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