update zh-Hans translation
update zh-Hans translation

Change-Id: I04d6bfb004fe0965d1ce2bd1d748731ea5fcf8fe
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/226007
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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