update pt-BR translation
update pt-BR translation

Change-Id: I7fdc209220dc9fb94445ee1546b80bc7480b21ee

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