make partials source-agnostic

they're currently expecting a RecipientsCSV object - but we won't
always have that available if we're handling a single notification.

So make the partials take generic variables, and then use a jinja with
block to pass in the correct values from either the check csv page or
the check notification page.

Additionally set the notification check page to show errors nicely -
hide the send button if there were problems, and replace the header

app/templates/partials/check/message-too-long.html

@@ -4,7 +4,8 @@
       Message too long
     </h1>
     <p>
-      Text messages can’t be longer than {{ template|string|length }} characters. Your message is {{message_length}} characters.
+      Text messages can’t be longer than {{ SMS_CHAR_COUNT_LIMIT }} characters.
+      Your message is {{ template.content_count }} characters.
     </p>
   {% endcall %}
 </div>

app/templates/partials/check/not-allowed-to-send-to.html

@@ -1,11 +1,19 @@
+{% from "components/banner.html" import banner_wrapper %}
+
+{% macro skip_to_file_contents() %}
+  <p class="visually-hidden">
+    <a href="#{{ file_contents_header_id }}">Skip to file contents</a>
+  </p>
+{% endmacro %}
+
 <div class="bottom-gutter">
   {% call banner_wrapper(type='dangerous') %}
     <h1 class='banner-title'>
       You can’t send to
       {{ 'this' if count_of_recipients == 1 else 'these' }}
-      {{ recipients.recipient_column_headers[0] }}
+      {{ template_type_label }}
       {%- if count_of_recipients != 1 -%}
-        {{ 'es' if 'email address' == recipients.recipient_column_headers[0] else 's' }}
+        {{ 'es' if 'email address' == template_type_label else 's' }}
       {%- endif %}
     </h1>
     <p>

app/templates/views/check.html

@@ -120,7 +120,12 @@
     </div>
 
   {% elif not recipients.allowed_to_send_to %}
-    {% include "partials/check/not-allowed-to-send-to.html" %}
+    {% with
+      count_of_recipients=count_of_recipients,
+      template_type_label=recipients.recipient_column_headers[0]
+    %}
+      {% include "partials/check/not-allowed-to-send-to.html" %}
+    {% endwith %}
   {% elif recipients.more_rows_than_can_send %}
     {% include "partials/check/too-many-messages.html" %}
   {% else %}

app/templates/views/notifications/check.html

@@ -1,20 +1,29 @@
 {% extends "withnav_template.html" %}
-<!-- {% from "components/banner.html" import banner_wrapper %} -->
-<!-- {% from "components/table.html" import list_table, field, text_field, index_field, hidden_field_heading %} -->
-<!-- {% from "components/file-upload.html" import file_upload %} -->
-<!-- {% from "components/page-footer.html" import page_footer %} -->
 {% from "components/radios.html" import radio_select %}
 {% from "components/message-count-label.html" import message_count_label %}
 
 {% block service_page_title %}
-  {{ "Error" if errors else "Preview" }}
+  {{ "Error" if error else "Preview" }}
 {% endblock %}
 
 {% block maincolumn_content %}
-
-  <h1 class="heading-large">
-    Preview of {{ template.name }}
-  </h1>
+  {% if error == 'not-allowed-to-send-to' %}
+    {% with
+      count_of_recipients=1,
+      template_type_label='phone number'
+    %}
+      {% include "partials/check/not-allowed-to-send-to.html" %}
+    {% endwith %}
+  {% elif error == 'more_rows_than_can_send' %}
+    {% include "partials/check/too-many-messages.html" %}
+  {% elif error == 'row_errors' %}
+    {# the only row_errors we can get when sending one off messages is that the message is too long #}
+    {% include "partials/check/message-too-long.html" %}
+  {% else %}
+    <h1 class="heading-large">
+      Preview of {{ template.name }}
+    </h1>
+  {% endif %}
 
   {{ template|string }}
 
@@ -22,10 +31,12 @@
     <form method="post" enctype="multipart/form-data" action="{{url_for('main.send_notification', service_id=current_service.id, template_id=template.id)}}" class='page-footer'>
       <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
       <input type="hidden" name="help" value="{{ '3' if help else 0 }}" />
-      {% if template.template_type != 'letter' or not request.args.from_test %}
-      <input type="submit" class="button" value="Send 1 {{ message_count_label(1, template.template_type, suffix='') }}" />
-      {% else %}
-        <a href="{{ url_for('main.check_messages_preview', service_id=current_service.id, template_type=template.template_type, upload_id=upload_id, filetype='pdf') }}" download="download" class="button">Download as a printable PDF</a>
+      {% if not error %}
+        {% if template.template_type != 'letter' or not request.args.from_test %}
+        <input type="submit" class="button" value="Send 1 {{ message_count_label(1, template.template_type, suffix='') }}" />
+        {% else %}
+          <a href="{{ url_for('main.check_messages_preview', service_id=current_service.id, template_type=template.template_type, upload_id=upload_id, filetype='pdf') }}" download="download" class="button">Download as a printable PDF</a>
+        {% endif %}
       {% endif %}
       <a href="{{ back_link }}" class="page-footer-back-link">Back</a>
     </form>