Consolidate page templates for emails + texts

Use one page template for each of:
- choosing a message template
- adding recipients
- checking an email message
- looking at a job

This commit consolidates the two templates into one, and adds logic to show
the SMS message pattern or the email message pattern depending on the type of
template.

It also gives email templates a bit more width, because the body and the from
address tend to be quite long.

app/templates/views/check.html

@@ -0,0 +1,84 @@
+{% extends "withnav_template.html" %}
+{% from "components/email-message.html" import email_message %}
+{% from "components/sms-message.html" import sms_message %}
+{% from "components/table.html" import list_table, field %}
+{% from "components/placeholder.html" import placeholder %}
+{% from "components/file-upload.html" import file_upload %}
+{% from "components/page-footer.html" import page_footer %}
+
+{% block page_title %}
+  {{ "Check and confirm" if upload_result.valid else page_heading }} – GOV.UK Notify
+{% endblock %}
+
+{% block maincolumn_content %}
+
+
+  {% if template.additional_data %}
+    {{ banner(
+      "Remove these columns from your CSV file:" + ", ".join(template.missing_data),
+      type="dangerous"
+    ) }}
+  {% elif not upload_result.valid %}
+    {{ banner(
+      "Your CSV file contained missing or invalid data",
+      type="dangerous"
+    ) }}
+  {% endif %}
+
+  <h1 class="heading-large">
+    {{ "Check and confirm" if upload_result.valid else page_heading }}
+  </h1>
+
+  {% if 'email' == template.template_type %}
+    {{ email_message(
+      template.subject,
+      template,
+      from_address='{}@notifications.service.gov.uk'.format(service.email_from),
+      from_name=service.name
+    )}}
+  {% elif 'sms' == template.template_type %}
+    <div class="grid-row">
+      <div class="column-two-thirds">
+        {{ sms_message(template)}}
+      </div>
+    </div>
+  {% endif %}
+
+  {% if upload_result.valid %}
+    <form method="post" enctype="multipart/form-data">
+      <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
+      <input type="submit" class="button" value="{{ "Send {} text message{}".format(upload_result.rows|count, '' if upload_result.rows|count == 1 else 's') }}" />
+      <a href="{{url_for('.send_messages', service_id=service_id, template_id=template.id)}}" class="page-footer-back-link">Back</a>
+    </form>
+  {% else %}
+    {{file_upload(form.file, button_text='Upload a CSV file')}}
+  {% endif %}
+
+  {% call(item) list_table(
+    upload_result.rows,
+    caption=original_file_name,
+    field_headings=column_headers
+  ) %}
+    {% if item.to or ''|valid_phone_number %}
+      {% call field() %}
+        {{ item.to }}
+      {% endcall %}
+    {% else %}
+      {% call field(status='missing') %}
+        {{ item.to }}
+      {% endcall %}
+    {% endif %}
+    {% for column in template.placeholders %}
+      {% if item.get(column) %}
+        {% call field() %}
+          {{ item.get(column) }}
+        {% endcall %}
+      {% else %}
+        {% call field(status='missing') %}
+          missing
+        {% endcall %}
+      {% endif %}
+    {% endfor %}
+  {% endcall %}
+
+{% endblock %}