update pt-BR translation
update pt-BR translation

Change-Id: Ic5c5e68575397e9ccdaf2254764ae23be790b3ad

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