Merge branch 'develop' into 6328-support-php-8-x

install/lib/installer_base.lib.php

install/sql/incremental/upd_dev_collection.sql

install/sql/ispconfig3.sql

install/tpl/debian6_dovecot-sql.conf.master

install/tpl/debian_dovecot-sql.conf.master

install/tpl/fedora_dovecot-sql.conf.master

install/tpl/opensuse_dovecot-sql.conf.master

install/tpl/server.ini.master

interface/lib/app.inc.php

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

interface/lib/classes/remote.d/mail.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

interface/lib/lang/de.lng

interface/lib/lang/dk.lng

interface/lib/lang/el.lng

interface/lib/lang/en.lng