update th translation
update th translation

Change-Id: I8efa7b7660f57b7745edd181e67b44af6104e9fe
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/290343
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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