Improve rule views by wrapping lines (#4702)

With the addition of the errors in the views list, it is now difficult
to have a view on all the rules in a screen witdh.

This commit adds wrapping to improve the overall display of the rules
page.

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>

web/ui/static/css/rules.css

@@ -5,7 +5,7 @@ table th tr td h2 {
   font-size: 26px;
 }
 .rule_cell {
- white-space: pre;
+ white-space: pre-wrap;
  background-color: #F5F5F5;
  display: block;
  font-family: monospace;