update pt-BR translation
update pt-BR translation

Change-Id: I8ec6731ed26aed90ae3b563fbfc37547b3dc2a42

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