update th translation
update th translation

Change-Id: I212ce4cf930ed39c14cc50fb6d57ab6c153a19e8
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/293189
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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