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

Change-Id: Ib622f0b2a6f0d70f86242ecde9450bd99afbc7b5
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/234138
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