Helder, I apologise for not following up directly with you on this, but the plural rule for pt-BR is already correct in CLDR. The question came up while they were processing the pt change. I confirmed to them that pt-BR was the same. The change went in on CLDR 1.8 and must be live now. This can be confirmed at CLDR Language Plural Rules#pt (pt at CLDR is the fallback, and comes from pt-BR).