update zh-Hans translation
update zh-Hans translation

Change-Id: Ib6d453c8da252b9b331c6264d835bd510babaa7f
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/223656
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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