Allow elaboration when ‘something else’ is chosen

Letting people input a bit of free text should reduce the amount of back
and forth we have to do over support tickets when setting up someone’s
branding.

If something else is the only option then we don’t show the radio button
at all and have just the free text input on the page (not behind a
progressive disclosure).

app/main/views/service_settings.py

@@ -1047,12 +1047,17 @@ def branding_request(service_id):
                 '\n---'
                 '\nCurrent branding: {current_branding}'
                 '\nBranding requested: {branding_requested}'
+                '{new_paragraph}'
+                '{detail}'
+                '\n'
             ).format(
                 organisation=current_service.organisation.as_info_for_branding_request(current_user.email_domain),
                 service_name=current_service.name,
                 dashboard_url=url_for('main.service_dashboard', service_id=current_service.id, _external=True),
                 current_branding=current_service.email_branding_name,
                 branding_requested=dict(form.options.choices)[form.options.data],
+                new_paragraph='\n\n' if form.something_else.data else '',
+                detail=form.something_else.data or ''
             ),
             ticket_type=zendesk_client.TYPE_QUESTION,
             user_email=current_user.email_address,