Merged revisions 3557-3594 from 3.0.5 stable branch.

install/sql/incremental/upd_0043.sql

install/sql/ispconfig3.sql

interface/lib/classes/aps_guicontroller.inc.php

interface/lib/classes/remoting.inc.php

interface/lib/classes/remoting_lib.inc.php

interface/lib/classes/tform.inc.php

interface/lib/lang/de.lng

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

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

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

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

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

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

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

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

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

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

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

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

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