Fix plural of time/times for visits to page (mdn#80)

Author: hamishwillee

catalog/templates/index.html

@@ -27,6 +27,6 @@ <h2>Dynamic content</h2>
 </ul>
 
 
-You have visited this page {{ num_visits }} times.
+You have visited this page {{ num_visits }} time{% if num_visits > 1 %}s{% endif %}.
 
-{% endblock %}
+{% endblock %}