Update ko.coffee (#5658)
Update ko.coffee (#5658)

* added translations "게임 시작, 교실편"

* Update ko.coffee

* Update ko.coffee

* Update ko.coffee

Co-authored-by: LeeJaeWon <ec051341e09937fa2d459ce0a8e1734e54d3433c@naver.com>
Co-authored-by: Valentin Bryukhanov <53545457af642b0f8712bb2cc004f120ce4436f4@gmail.com>
javatlacati/codecombat,codecombat/codecombat,javatlacati/codecombat,javatlacati/codecombat,codecombat/codecombat,javatlacati/codecombat,codecombat/codecombat,codecombat/codecombat,javatlacati/codecombat,codecombat/codecombat