Example, what you can put into template files:

<?php if($lang_code == 'hr'): ?>
ga('linker:autoLink', ['website.hr']);
<?php elseif($lang_code == 'en'): ?>
ga('linker:autoLink', ['website.en']);
<?php elseif($lang_code == 'de'): ?>
ga('linker:autoLink', ['website.de']);
<?php endif; ?>