add russian translations to i18n

changelogs/unreleased/34880-add-russian-translations-to-i18n.yml

+---
+title: Add Russian translations for Cycle Analytics & Project pages & Repository pages & Commits pages & Pipeline Charts.
+merge_request: 12743
+author: Huang Tao

lib/gitlab/i18n.rb

@@ -12,6 +12,7 @@ module Gitlab
       'zh_HK' => '繁體中文(香港)',
       'zh_TW' => '繁體中文(臺灣)',
       'bg' => 'български',
+      'ru' => 'Русский',
       'eo' => 'Esperanto',
       'it' => 'Italiano'
     }.freeze