Bug 1551273 - Turning on DS for non-nightly users (#5137)
Bug 1551273 - Turning on DS for non-nightly users (#5137)

* turn on DS for en-US and select locales for nightly

* locales check

mozilla/activity-stream,Mardak/activity-stream,mozilla/activity-streams,mozilla/activity-streams,Mardak/activity-stream,mozilla/activity-stream,Mardak/activity-stream,Mardak/activity-stream,mozilla/activity-stream,mozilla/activity-stream