The plural form is only looked up by the language part of the locale, e.g. pt for pt_BR.
But for Brazilian Portuguese the plural form is different from Portuguese so it should be first checked if there is a plural function for the whole locale and only if not fallback to the language part.
pt_BR: Plural-Forms: nplurals=2; plural=n>1;
pt: Plural-Forms: nplurals=2; plural=n != 1;
The plural form is only looked up by the language part of the locale, e.g.
ptforpt_BR.But for Brazilian Portuguese the plural form is different from Portuguese so it should be first checked if there is a plural function for the whole locale and only if not fallback to the language part.
pt_BR:Plural-Forms: nplurals=2; plural=n>1;pt:Plural-Forms: nplurals=2; plural=n != 1;