Merge pull request #468 from dokuwiki-translate/lang_update_542

inc/lang/ko/backlinks.txt

inc/lang/ko/denied.txt

inc/lang/ko/lang.php

inc/lang/ko/mailtext.txt

inc/lang/ko/pwconfirm.txt

inc/lang/ko/register.txt

inc/lang/ko/registermail.txt

inc/lang/ko/subscr_digest.txt

inc/lang/ko/subscr_list.txt

inc/lang/ko/subscr_single.txt

inc/lang/ko/uploadmail.txt

lib/plugins/acl/lang/ko/lang.php

lib/plugins/authad/lang/ko/settings.php

lib/plugins/plugin/lang/ko/lang.php

lib/plugins/popularity/lang/ko/lang.php

lib/plugins/usermanager/lang/ko/lang.php