list available languages and topics for links, and allow for their dynamic display

themes/hugo-sustain/layouts/partials/js.html

@@ -1,5 +1,6 @@
 <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
 <script src="{{ .Site.BaseURL }}js/jquery-1.11.3.min.js"></script>
+<script src="{{ .Site.BaseURL }}js/filter-tags.js"></script>
 <!-- Bootstrap core JavaScript -->
 <!--<script src="{{ .Site.BaseURL }}js/bootstrap-3.3.7.min.js" ></script>-->
 {{ range .Site.Params.custom_js -}}