Merge branch 'master' of git.ispconfig.org:ispconfig/ispconfig3

install/sql/incremental/upd_0079.sql

install/sql/ispconfig3.sql

interface/lib/classes/plugin_directive_snippets.inc.php

interface/lib/lang/en.lng

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

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

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

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

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

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

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

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

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

interface/web/admin/templates/directive_snippets_edit.htm

interface/web/admin/templates/server_config_web_edit.htm

interface/web/admin/templates/users_user_edit.htm

interface/web/client/lib/lang/de_client.lng

interface/web/client/lib/lang/en_client.lng

interface/web/client/templates/client_edit_limits.htm

interface/web/dns/dns_soa_edit.php