update nb-x-k12 translation
update nb-x-k12 translation

Change-Id: Ib1674e5c69c9096dd3c6fe3018f4f4246490dc09
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/258690
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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