Merge remote-tracking branch 'origin/master' into loggedin-class

_test/tests/inc/common_basicinfo.test.php

_test/tests/inc/common_mediainfo.test.php

_test/tests/inc/common_ml.test.php

_test/tests/inc/media_isexternal.test.php

_test/tests/inc/pageutils_clean_id.test.php

conf/wordblock.conf

doku.php

inc/DifferenceEngine.php

inc/Mailer.class.php

inc/auth.php

inc/common.php

inc/feedcreator.class.php

inc/fetch.functions.php

inc/fulltext.php

inc/lang/de-informal/lang.php

inc/lang/ko/draft.txt

inc/lang/ko/lang.php

inc/lang/ko/login.txt

inc/lang/ko/newpage.txt

inc/lang/ko/norev.txt