Allow adding broadcast templates

At the moment the page is the same as for text message templates,
except:
- different H1
- no guidance about personalisation, links, etc (until we decide how
  these should work)

For now you won’t be able to really create a broadcast template, because
the API doesn’t support it (the API will respond with a 400). But that’s
OK because no real services have the broadcast permission yet.

This required a bit of refactoring of how we check which template types
a service can use, because there were some hard-coded assumptions about
emails and text messages.

app/templates/components/message-count-label.html

@@ -24,6 +24,12 @@
     {%- else -%}
       letters
     {%- endif -%}
+  {%- elif template_type == 'broadcast' -%}
+    {%- if count == 1 -%}
+      broadcast
+    {%- else -%}
+      broadcasts
+    {%- endif -%}
   {%- endif %} {{ suffix }}
 {%- endmacro %}
 

app/templates/views/edit-broadcast-template.html

@@ -0,0 +1,31 @@
+{% extends "withnav_template.html" %}
+{% from "components/textbox.html" import textbox %}
+{% from "components/page-header.html" import page_header %}
+{% from "components/page-footer.html" import sticky_page_footer %}
+{% from "components/form.html" import form_wrapper %}
+
+{% block service_page_title %}
+  {{ heading_action }} broadcast template
+{% endblock %}
+
+{% block maincolumn_content %}
+
+  {{ page_header(
+    '{} broadcast template'.format(heading_action),
+    back_link=url_for('main.view_template', service_id=current_service.id, template_id=template.id) if template else url_for('main.choose_template', service_id=current_service.id, template_folder_id=template_folder_id)
+  ) }}
+
+  {% call form_wrapper() %}
+    <div class="govuk-grid-row">
+      <div class="govuk-grid-column-two-thirds">
+        {{ textbox(form.name, width='1-1', hint='Your recipients will not see this') }}
+      </div>
+      <div class="govuk-grid-column-two-thirds">
+        {{ textbox(form.template_content, highlight_placeholders=True, width='1-1', rows=5) }}
+        {{ sticky_page_footer('Save') }}
+      </div>
+    </div>
+  {% endcall %}
+
+
+{% endblock %}