Fix missing string in admin UI (#19809)

config/locales/en.yml

@@ -283,6 +283,7 @@ en:
         update_ip_block_html: "%{name} changed rule for IP %{target}"
         update_status_html: "%{name} updated post by %{target}"
         update_user_role_html: "%{name} changed %{target} role"
+      deleted_account: deleted account
       empty: No logs found.
       filter_by_action: Filter by action
       filter_by_user: Filter by user