update pt-BR translation
update pt-BR translation

Change-Id: I6b95b4457f00ec932e4c998455a35ed0f2ad6d81

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