PLURAL for pt-br
CLDR is a reviewed resource with a formal process. Linux distributions use it as a reliable source. For now, I am not inclined to want to change it in MediaWiki and deviate from CLDR. Please appeal with CLDR. If you *are* correct, that should be clear soon.
It doesn't actually say anything about pt-br, just for pt, whatever it means.
Then you please process this request. I said what I thought about it. It's easy enough, and I indicated that I will not take responsibility for doing what was asked.