add Italian translation to I18N

translated of Cycle Analytics Page
translated of Project Page
translated of Repository Page
add Changelog

Closes #34544

changelogs/unreleased/34544-add-italian-translation-of-cycle-analytics-page-&-project-page-&-repository-page.yml

+---
+title: Add Italian translation of Cycle Analytics Page & Project Page & Repository Page
+merge_request: 12578
+author: Huang Tao

lib/gitlab/i18n.rb

@@ -12,7 +12,8 @@ module Gitlab
       'zh_HK' => '繁體中文(香港)',
       'zh_TW' => '繁體中文(臺灣)',
       'bg' => 'български',
-      'eo' => 'Esperanto'
+      'eo' => 'Esperanto',
+      'it' => 'Italiano'
     }.freeze
 
     def available_locales