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

Change-Id: I766a05c0cdb14489a87797416bd978213e882613
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/234878
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