Merge branch 'master' of git.ispconfig.org:ispconfig/ispconfig3

helper_scripts/pdns-slave-zone-cleanup.sh

install/autoupdate.php

install/install.php

install/update.php

interface/lib/plugins/mail_user_filter_plugin.inc.php

interface/web/dns/dns_wizard.php

interface/web/dns/form/dns_template.tform.php

interface/web/dns/lib/lang/ar_dns_wizard.lng

interface/web/dns/lib/lang/bg_dns_wizard.lng

interface/web/dns/lib/lang/br_dns_wizard.lng

interface/web/dns/lib/lang/cz_dns_wizard.lng

interface/web/dns/lib/lang/de_dns_wizard.lng

interface/web/dns/lib/lang/el_dns_wizard.lng

interface/web/dns/lib/lang/en_dns_wizard.lng

interface/web/dns/lib/lang/es_dns_wizard.lng

interface/web/dns/lib/lang/fi_dns_wizard.lng

interface/web/dns/lib/lang/fr_dns_wizard.lng

interface/web/dns/lib/lang/hr_dns_wizard.lng

interface/web/dns/lib/lang/hu_dns_wizard.lng

interface/web/dns/lib/lang/id_dns_wizard.lng