pkg_mgr_installed.php - visually separate the legend
Some users think that it's related to the last package in the list, instead of being a legend.
I tried to produce something like the firewall rules legend, but adding "alert alert-info clearfix" to the <div> leaves whitespace on top and bottom; frankly, the code of the page sucks.
Fixed #7203 by visually separating the legend area
Make legen area fixed rather than AJAX data