update pt-BR translation
update pt-BR translation

Change-Id: Iaee495a9f644a9bfa3af2f4c7a16da15b54c9936

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