templates/modules/analytics.html

{% if GOOGLE_ANALYTICS_ID and GOOGLE_ANALYTICS_PROP %}
<script>
  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
  })(window,document,'script','https://ssl.google-analytics.com/analytics.js','ga');

  ga('create', '{{ GOOGLE_ANALYTICS_ID }}', '{{ GOOGLE_ANALYTICS_PROP }}');
  ga('send', 'pageview');
</script>
{% endif %}