update pt-BR translation
update pt-BR translation

Change-Id: I4c6456696121b0586f25c10bc5ea42d7da6918bd
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/254695
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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