Hi Ricardo,
My only concern was that we already have somone working on pt-BR using the Amanuens service, but I looked at his progress and he has not translated those 2 files yet, so you can zip them and email to me at joe dot audette at g mail dotcom and I will commit them to the source code repository. After that I will setup an account for you on Amanuens so you can help with the pt-BR translations.
Thanks,
Joe