Update ja.coffee (#5004)
Update ja.coffee (#5004)

Completed all HOC with the download_PDF
codecombat/codecombat,javatlacati/codecombat,jeremiahyan/codecombat,javatlacati/codecombat,jeremiahyan/codecombat,codecombat/codecombat,javatlacati/codecombat,jeremiahyan/codecombat,jeremiahyan/codecombat,javatlacati/codecombat,codecombat/codecombat,codecombat/codecombat,javatlacati/codecombat,codecombat/codecombat