update pt-BR translation
update pt-BR translation

Change-Id: I1b75b0b10ce1dba0c795997dc6d3be8c33915236

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