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

.gitlab-ci.yml

install/dist/conf/gentoo.conf.php

install/dist/tpl/gentoo/apache_ispconfig.vhost.master

install/lib/installer_base.lib.php

install/tpl/apache_apps.vhost.master

install/tpl/apache_apps.vhost.master

install/tpl/server.ini.master

install/tpl/system.ini.master

install/uninstall.php

interface/lib/classes/functions.inc.php

interface/lib/classes/ids.inc.php

interface/lib/plugins/system_config_dns_ca_plugin.inc.php

interface/web/admin/form/server_config.tform.php

interface/web/admin/form/system_config.tform.php

interface/web/admin/form/users.tform.php

interface/web/admin/lib/lang/ar_system_config.lng

interface/web/admin/lib/lang/bg_system_config.lng

interface/web/admin/lib/lang/br_system_config.lng

interface/web/admin/lib/lang/ca_system_config.lng

interface/web/admin/lib/lang/cz_system_config.lng