Hi Thomas,
Thank you very much for your reply. It used to work with the code below for the German version of the site. But somehow, after I updated the plugin this doesn’t work anymore (looks like GTM script is loaded twice).
<?php if( ICL_LANGUAGE_CODE=='de' ) : ?>
<!-- Google Tag Manager Germany -->
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','GTM-XXXXXXX');</script>
<!-- End Google Tag Manager Germany -->