Merge remote-tracking branch 'origin/develop' into 2558-two-factor-authentication

install/lib/compatibility.inc.php

install/lib/install.lib.php

install/lib/installer_base.lib.php

install/tpl/apache_ispconfig.vhost.master

interface/lib/app.inc.php

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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