update th translation
update th translation

Change-Id: Ide19e8f088d11afd285881effa00c79398a158fd
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/281570
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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