Code review comment for lp:~ilidrissi.amine/software-center/addons

Mohamed, thanks so much for working on this. I'm impressed.

From a quick test, I see a few interface glitches:

* By default, every software item screen now says "No changes to be done" by default. This text shouldn't ever be necessary.

* The add-ons section appears before the installed state bar. It should instead appear after the item description. <https://wiki.ubuntu.com/SoftwareCenter#software-item-screen>

* There should be a little more vertical space between add-ons. Currently the icon for the first add-on is closer to the icon for the second add-on than it is to its own title. Also, there should be more vertical space after "Choose add-ons:".

* Thunderbird lists 56 add-ons, of which about 50 of them are language/region packs, which should be installed from "System" > "Administration" > "Language Support" instead. Is there an easy way of recognizing language-pack add-ons to avoid showing them in USC?