update pt-BR translation
update pt-BR translation

Change-Id: Ia02c42fcd0d0f417a9613f174dff41cb939cf01a
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/286139
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