update pt-BR translation
update pt-BR translation

Change-Id: Ibeba39ce46674067c7bf0bb4fc827fa04599b86b

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