update pt-BR translation
update pt-BR translation

Change-Id: I6caf33543cc03e7431561eb741a0c51a29f99bd2

fronteerio/canvas-lms,SwinburneOnline/canvas-lms,roxolan/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,roxolan/canvas-lms,redconfetti/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,djbender/canvas-lms,HotChalk/canvas-lms,redconfetti/canvas-lms,venturehive/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,grahamb/canvas-lms,HotChalk/canvas-lms,roxolan/canvas-lms,HotChalk/canvas-lms,djbender/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,sfu/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,redconfetti/canvas-lms,HotChalk/canvas-lms,venturehive/canvas-lms,venturehive/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms,redconfetti/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,roxolan/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms