update zh-Hans translation
update zh-Hans translation

Change-Id: I97fbfd89f75f0d68cd7c6990619f3fafb66b3ec3
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/258710
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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