update zh-Hans translation
update zh-Hans translation

Change-Id: I7efbb8499ae7e028de76c0a5c8cd66833069b00d
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/271452
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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