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

Change-Id: I4722497b2201827ee0c1a6d7cb86c24b749d6bc6
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/275051
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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