PT-BR locale have unusual week days abreviation

[leandrocorso]

The week days abreviation described in "locale/pt-BR/_lib/locale/index.js:27" is not usual in brazilian portuguese, the most correct should to be:

var dayValues = {
narrow: ['D', 'S', 'T', 'Q', 'Q', 'S', 'S'],
short: ['dom', 'seg', 'ter', 'qua', 'qui', 'sex', 'sab'],
abbreviated: ['domingo', 'segunda', 'terça', 'quarta', 'quinta', 'sexta', 'sábado']
wide: ['domingo', 'segunda-feira', 'terça-feira', 'quarta-feira', 'quinta-feira', 'sexta-feira', 'sábado']
};

[frankyston]

I performed the requested correction:

#2170