Change Google analytics load script to tag, instead of traditional an…

…alytics.js

extensions/odoo_theme/layout_templates/google_analytics.html

@@ -1,10 +1,8 @@
+<!-- Google tag (gtag.js) -->
+<script async src="https://www.googletagmanager.com/gtag/js?id={{ google_analytics_key }}"></script>
 <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', '{{ google_analytics_key }}', 'auto');
-    ga('set', 'anonymizeIp', true);
-    ga('send','pageview');
-</script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+  gtag('config', '{{ google_analytics_key }}');
+</script>