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

Change-Id: I43968919a974360ece71445495df78ee3b475d3e
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/231807
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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