Add current PHP enhancements (WiP)

install/sql/incremental/upd_dev_collection.sql

install/sql/ispconfig3.sql

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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