At the moment, much of the documentation is written in English. Some libraries already have initials to translate documentation into other languages, see Django, for example.
If English is still a barrier for you, may I suggest that in the libraries you seek support is:
- search for references in Portuguese: authors of books, forums, communities or even search on twitter;
- open an issue or report that the library does not support other languages. perhaps this is the initial step for you to consider and start something along these lines
- if some of these libraries already have some translation project, see how you can collaborate to get the work going
- as far as possible include, even self-taught, some time of your week to study some English. It’s super tooling.
Other than that, there’s not much to be done, unfortunately.
Maybe some suggestion left out, but I hope it helps you now.