The documentation in Portuguese was started quite some time ago and
abandoned:
https://trisquel.info/en/wiki/documenta%C3%A7%C3%A3o-portugu%C3%AAs-br
Feel free to revive it: the whole official documentation is a wiki. Click on
the flags on the upper-right part of the interface to access the
documentation in other languages.
I would like to point out that several users talk about developing work and
mention languages such as C. However, as far as I understand, most of the
work lies in package helpers that are small Shell scripts. In their simpler
form, they almost only call sed's substitution command. In that context, the
most important skill must be to know regexps:
https://en.wikipedia.org/wiki/Regular_expression#Standards
