Merge branch 'develop' into nginx_TLSv1.3_detection

install/dist/conf/centos72.conf.php

install/dist/conf/centos80.conf.php

install/dist/lib/debian60.lib.php

install/dist/lib/fedora.lib.php

install/dist/lib/gentoo.lib.php

install/dist/lib/opensuse.lib.php

install/lib/installer_base.lib.php

install/tpl/debian6_dovecot2.conf.master

install/tpl/debian_dovecot2.conf.master

install/tpl/fedora_dovecot2.conf.master

install/tpl/fedora_postfix.conf.master

install/tpl/mysql-virtual_forwardings.cf.master

install/tpl/opensuse_dovecot2.conf.master

interface/lib/classes/auth.inc.php

interface/lib/classes/remote.d/server.inc.php

interface/lib/lang/ar.lng

interface/lib/lang/bg.lng

interface/lib/lang/br.lng

interface/lib/lang/ca.lng

interface/lib/lang/cz.lng