Add this line in head on Default Layout on english:
<link rel="alternate" type="application/rss+xml" title="RSS" href=/*recent.rss />
This would mean that searches (and probably blogs) would have more than one feed, so we want to make sure that the one we want to be auto-discovered is first.
default to auto-discovery of recent changes feed+discussed in support tickets
default to auto-discovery of recent changes feed+relevant user stories