update ko translation
update ko translation

Change-Id: I0bca33f11bc92f4ae3b533ed178d14d9ce0a124f
Reviewed-on: https://gerrit.instructure.com/206888
Tested-by: Jenkins

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