Add separate messages for invited/team member

2 messages seems like a good idea.

app/main/views/manage_users.py

@@ -65,10 +65,12 @@ def invite_user(service_id, user_id=None):
 
     if user_id:
         user_to_invite = User.from_id(user_id)
-        if (
-            user_to_invite.belongs_to_service(current_service.id)
-            or current_service.invite_pending_for(user_to_invite.email_address)
-        ):
+        if user_to_invite.belongs_to_service(current_service.id):
+            return render_template(
+                'views/user-already-team-member.html',
+                user_to_invite=user_to_invite,
+            )
+        if current_service.invite_pending_for(user_to_invite.email_address):
             return render_template(
                 'views/user-already-invited.html',
                 user_to_invite=user_to_invite,

app/templates/views/user-already-invited.html

@@ -2,18 +2,19 @@
 {% from "components/page-header.html" import page_header %}
 
 {% block service_page_title %}
-  This person is already a team member
+  This person has already received an invite
 {% endblock %}
 
 {% block maincolumn_content %}
 
   {{ page_header(
-    '{} is already a team member'.format(user_to_invite.name),
+    'This person has already received an invite',
     back_link=url_for('main.manage_users', service_id=current_service.id)
   ) }}
 
   <p class="govuk-body">
-    Someone’s already invited them. You do not need to do anything.
+    {{ user_to_invite.name }} has not accepted their invitation to
+    ‘{{ current_service.name }}’ yet. You do not need to do anything.
   </p>
 
 {% endblock %}

app/templates/views/user-already-team-member.html

@@ -0,0 +1,19 @@
+{% extends "withnav_template.html" %}
+{% from "components/page-header.html" import page_header %}
+
+{% block service_page_title %}
+  This person is already a team member
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  {{ page_header(
+    'This person is already a team member',
+    back_link=url_for('main.manage_users', service_id=current_service.id)
+  ) }}
+
+  <p class="govuk-body">
+    {{ user_to_invite.name }} is already member of ‘{{ current_service.name }}’.
+  </p>
+
+{% endblock %}