Stop at once
Sorry, editing one message is not a compelling reason to get translator rights. You don't seem to be interested in systematically working on the qqq or en-gb locales, and your insistence on getting that pt-br message edited by persons (like us) without pt-br knowledge makes me think you still didn't fully grasp how translatewiki.net operates.
Your work and interest is appreciated, but I don't see a need for you to have translator rights. Let's talk again when you learn another language. :D
I may not know pt-br language but the messages are the same. that is why I am asking can I edit that one message please.
In reverting your edits, I did see there were good intentions in them. If some error in messages is going unnoticed, please post messages on the talk pages of the language (for instance portal talk:pt) or of the translator (if still active).