Merge branch 'stable-3.1'

install/dist/lib/fedora.lib.php

install/dist/lib/opensuse.lib.php

install/lib/installer_base.lib.php

install/tpl/system.ini.master

interface/lib/classes/tform_actions.inc.php

interface/lib/lang/ru.lng

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

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

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

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

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

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

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

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

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

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

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

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

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

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