I certainly have my system not set to a Djibouti format, the region dropdown menu is showing no value, and the example dates are in the wrong language. LANG is set to en_US.UTF-8. gnome-control-center shows the correct values ("English (United States)").
#138 is the first of some changes that will start to improve this. Available languages are now listed in the left pane on Fedora with this branch. There's still a lot of Ubuntu specific code in this plug that will need to be cleaned up that's causing these issues.