Fix back_courses_false i18n key error
Fix back_courses_false i18n key error

Wrong ternary syntax was used for CoffeeScript in a coco/ozar merge

javatlacati/codecombat,codecombat/codecombat,codecombat/codecombat,javatlacati/codecombat,codecombat/codecombat,javatlacati/codecombat,javatlacati/codecombat,codecombat/codecombat,codecombat/codecombat,javatlacati/codecombat