update pt-BR translation
update pt-BR translation

Change-Id: I829da5f271d004c3b87b18845b197f4831f4b951

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