[OpenStack-I18n] Simplified Chinese cannot be found in the language list in Horizon

Hello I18n team. I am currently checking/reviewing the latest translations on the Horizon UI with another member and we found that Simplified Chinese is not in the list on the user setting page. I am using a devstack from master branch, only deployed a couple of days ago. I wonder if other people see the same issue. The list is looking like the following. ​ Many thanks in advance, Yuko