update pt-BR translation
update pt-BR translation

Change-Id: Ia9aa7c81bbe96d6b84a8932f3c718fbffdd83117
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/233821
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

sfu/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms