orange prices for mobile listing pages (bug 712762)

media/css/mobile/listing.less

@@ -114,7 +114,7 @@ li.item {
         padding: 0 10px;
     }
     .vital {
-        color: green;
+        color: @green;
         padding-left: .5em;
         &:before {
             color: #aaa;
@@ -127,6 +127,9 @@ li.item {
                 display: none;
             }
         }
+        &.premium {
+            color: @orange;
+        }
     }
     .stars, i, .vital {
         display: block;