update pt translation
update pt translation

Change-Id: Ibd2f29ba675c127d897edd94bfb3c9b4bafdb1fe
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/228001
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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