update zh-Hans translation
update zh-Hans translation

Change-Id: I879b8f19b78e85eb648a4295d3e4e2f15ce4d9a8
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/231642
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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