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

Change-Id: I3e6532ae36cfbbba530c5673799e2440e2fea934
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/291397
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms