[old css] use aColor property

--HG--
branch : stable

web/data/cubicweb.old.css

@@ -56,7 +56,7 @@ h6{
 }
 
 a, a:active, a:visited, a:link {
-  color: #ff4500;
+  color: %(aColor)s;
   text-decoration: none;
 }