Documentation: update pt-BR
Documentation: update pt-BR

Translate some english words to portuguese and fix some
typos on translation.

Signed-off-by: Thiago Farina <2a0e9cb90b21b2938e0b17d56218ee872370e237@gmail.com>
Signed-off-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git