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

interface/lib/classes/listform.inc.php

interface/lib/classes/listform_tpl_generator.inc.php

interface/lib/classes/tform_tpl_generator.inc.php

interface/web/admin/software_package_install.php

interface/web/admin/software_package_list.php

interface/web/admin/software_update_list.php

interface/web/admin/templates/directive_snippets_edit.htm

interface/web/admin/templates/directive_snippets_list.htm

interface/web/admin/templates/firewall_edit.htm

interface/web/admin/templates/firewall_list.htm

interface/web/admin/templates/groups_edit.htm

interface/web/admin/templates/groups_list.htm

interface/web/admin/templates/iptables_edit.htm

interface/web/admin/templates/iptables_list.htm

interface/web/admin/templates/language_add.htm

interface/web/admin/templates/language_complete.htm

interface/web/admin/templates/language_edit.htm

interface/web/admin/templates/language_export.htm

interface/web/admin/templates/language_import.htm

interface/web/admin/templates/language_list.htm