Test that the right permissions in page

This commit makes sure that the right permission choices are shown in
these pages:
- manage team page
- invite a user page
- edit permissions page

This is in order to make changing these pages easier (see subsequent
commits).

app/templates/views/invite-user.html

@@ -4,13 +4,13 @@
 {% from "components/page-footer.html" import page_footer %}
 
 {% block service_page_title %}
-Manage users
+  Invite a team member
 {% endblock %}
 
 {% block maincolumn_content %}
 
   <h1 class="heading-large">
-    {{ "Invite a team member" }}
+    Invite a team member
   </h1>
 
   <div class="grid-row">