Remove the ‘manage templates’ page

The ‘manage templates’ page was almost identical to the ‘send text messages’
page.

This commit consolidates them into one and makes them all hang together.

Part of this means tweaks to the javascript so that files upload as soon as
you’ve chosen them.

app/templates/components/file-upload.html

@@ -1,7 +1,7 @@
 {% macro file_upload(field, button_text="Choose file") %}
   <div class="form-group{% if field.errors %} error{% endif %}" data-module="file-upload">
     <label class="file-upload-label" for="{{ field.name }}">
-      {{ field.label }}
+      <span class="visually-hidden">{{ field.label }}</span>
       {% if hint %}
         <span class="form-hint">
           {{ hint }}

app/templates/components/page-footer.html

@@ -13,14 +13,14 @@
       <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
       <input type="submit" class="button{% if destructive %}-destructive{% endif %}" value="{{ button_text }}" />
     {% endif %}
-    {% if delete_link %}
-      <span class="page-footer-delete-link">
-        or <a href="{{ delete_link }}">{{ delete_link_text }}</a>
-      </span>
-    {% endif %}
     {% if back_link %}
       <a class="page-footer-back-link" href="{{ back_link }}">{{ back_link_text }}</a>
     {% endif %}
+    {% if delete_link %}
+      <span class="page-footer-delete-link">
+        <a href="{{ delete_link }}">{{ delete_link_text }}</a>
+      </span>
+    {% endif %}
     {% if secondary_link and secondary_link_text %}
       <a class="page-footer-secondary-link" href="{{ secondary_link }}">{{ secondary_link_text }}</a>
     {% endif %}