update pt-BR translation
update pt-BR translation

Change-Id: Ief3bb5f59cc2e4c8f1538fc240be76d5aa2e9d7e

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