update zh-Hans translation
update zh-Hans translation

Change-Id: I9dccba14c05ac925050838f92f85c0ac7be581c4
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/274951
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