It appears that we've been getting ""GET /static/img/line-bottom.png HTTP/1.1" 404" for quite some time now...
commit fb18e118d108a8965a2ea8a2087bf1baa88cc193
Author: Martin Krizek <mkrizek@redhat.com>
Date: Tue Dec 17 10:47:34 2013 +0100
Rename line.png to line-bottom.png to reflect the actual state of css.