adds es6 symbol polyfill to fix IE

opentech/apply/funds/templates/funds/base_submissions_table.html

@@ -18,6 +18,7 @@
 {% block extra_js %}
     {{ filter.form.media.js }}
     <script src="{% static 'js/apply/all-submissions-table.js' %}"></script>
+    <script src="https://cdn.jsdelivr.net/npm/symbol-es6@0.1.2/symbol-es6.min.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/url-search-params/1.1.0/url-search-params.js"></script>
     <script src="{% static 'js/apply/submission-filters.js' %}"></script>
     <script src="{% static 'js/apply/submission-tooltips.js' %}"></script>