Merge branch 'develop' into '6497_php_sort_version_3'

install/sql/incremental/upd_dev_collection.sql

install/sql/ispconfig3.sql

install/tpl/postfix_3-0.conf.master

install/tpl/server.ini.master

interface/lib/classes/tform_base.inc.php

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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