separate urgent and p1 concepts in feedback.

p1 == "should notify team be alerted of this (via pagerduty)"
urgent == "should the user be told we'll look at it"

* If it's in office hours, it's always urgent. It's never a P1 because
  we'll notice it anyway
* If it's outside of office hours, it's urgent and P1 if it's severe,
  otherwise it's neither

app/templates/views/service-settings.html

@@ -336,7 +336,7 @@
         {% endif %}
         <li class="bottom-gutter">
           <a href="{{ url_for('.service_switch_email_auth', service_id=current_service.id) }}" class="button">
-            {{ 'Stop editing user auth' if 'email_auth' in current_service.permissions else 'Allow editing user auth' }}
+            {{ 'Stop user auth type editing' if 'email_auth' in current_service.permissions else 'Allow user auth type editing' }}
           </a>
         </li>
         {% if current_service.active %}