update th translation
update th translation

Change-Id: I3cce7e74b4c9a86eaaaaf280b55e3a41b81fec23
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/278952
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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