Poor heading shown for multi-item exhibit

software-center trunk r2309, Ubuntu 11.10 beta 1

1. PISTON_MINI_CLIENT_DISABLE_SSL_VALIDATION=1 SOFTWARE_CENTER_BUY_HOST=http://sc.staging.ubuntu.com/ ./software-center
2. Click on the banner for "frozen bubble, k3b, vim and blender".
3. Look at the header for the list.

What you see: "frozen-bubble,k3b,vim,blender"

What you should see: "Morley's morsels", or some similarly imaginative title.

This is because the API no longer includes a title_translated field, on the grounds that the HTML made it unnecessary. But it's still necessary when showing the list. (Even when we switch from the list view to a tile view later, we couldn't really just reuse the banner verbatim, because that would risk looking as if clicking the banner hadn't done anything.)

A short-term improvement in the client would be to show no heading at all, rather than the list of package names. Beyond that, though, we probably need to reintroduce title_translated in the API and the admin interface.