smaller (since esp. icons are small anyway and look ugly
when scaled up), removed 'state' label.
The flags are now shown as well (not sure if they should
be all translated), and only approved addons are shown
for people without artist-debug mode set.
Added callback to header list (which don't do anything atm).
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@8638 178a84e3-b1eb-0310-8ba1-8eac791a3b58
af710f70d8