Gn gwtp 59

As far as I can see, this is still the classical Google Analytics implementation. 
You should have something like this at some point :
```html
<!-- Google Analytics -->
<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','//www.google-analytics.com/analytics.js','ga');

ga('create', 'UA-XXXX-Y', 'auto');  // Replace with your property ID.
ga('send', 'pageview');

</script>
<!-- End Google Analytics -->
```
(see https://developers.google.com/analytics/devguides/collection/upgrade/reference/gajs-analyticsjs?hl=fr#snippet)