I have a fbconnect+feed_user_join filled up but in newsfeed it shows as
fbconnect+feed_user_join what's up?
and go to the languages section in the admin panel and click on the "Save this page" butotn at the bottom of the page to clear language cache. See if the issue persists.
Have you properly translated your ES version? provide screenshot of your ES version for fbconnect+feed_user_join key
Marcus, provide screenshot of the value filled up for this key: fbconnect+feed_user_join
Try to import langs.zip file from FB connect archive into the Languages section