Feature: [saved export] Create a "saved export"

src/Bundle/ChillMainBundle/Resources/views/Export/download.html.twig

@@ -49,5 +49,9 @@ window.addEventListener("DOMContentLoaded", function(e) {
              data-download-text="{{ "Download your report"|trans|escape('html_attr') }}"
         ><span id="waiting_text">{{ "Waiting for your report"|trans ~ '...' }}</span></div>
 
+        <div>
+            <a href="{{ chill_path_add_return_path('chill_main_export_save_from_key', { alias: alias, key: app.request.query.get('key')}) }}">{{ 'Save'|trans }}</a>
+        </div>
+
     </div>
 {% endblock content %}