update pt-BR translation
update pt-BR translation

Change-Id: I7d737edcc3bec4d91bd26475d7de8ba5c8d91f18

djbender/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,matematikk-mooc/canvas-lms,instructure/canvas-lms,grahamb/canvas-lms,grahamb/canvas-lms,djbender/canvas-lms,grahamb/canvas-lms,matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms