update ko translation
update ko translation

Change-Id: Ia58aff44e2f27e410247ea78288bda16fc791d84
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/255567
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