Link to failure reasons from job/activity pages

If something has failed and you don’t know why, you should be able to
find out why. Let’s try adding a link to the page explaining why, so
it’s not just buried in the footer.

app/templates/views/notifications.html

@@ -73,7 +73,13 @@
       ) }}
 
       {% call field(status=item.status|format_notification_status_as_field_status, align='right') %}
+        {% if item.status|format_notification_status_as_url %}
+          <a href="{{ item.status|format_notification_status_as_url }}">
+        {% endif %}
         {{ item.status|format_notification_status(item.template.template_type) }}
+        {% if item.status|format_notification_status_as_url %}
+          </a>
+        {% endif %}
       {% endcall %}
 
     {% endcall %}