update th translation
update th translation

Change-Id: Ie38ab9fbe5ace7002b55310a39e8523961d3ca1b
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/279919
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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