Comment 3 for bug 434173

Let's just integrate this into the installer for 9.10 - it's a regression fix. I don't know about update-manager - it would be a good idea to grab Michael Vogt and ask him about this if you haven't already.

I'm a little concerned about displaying a notification in postinsts as it seems that it would require some care to avoid continually spamming people with notifications in the event that they've explicitly decided not to install some particular piece of language support.