I can only tell you way you can place different code spinets based on language. I'am not sure how google itself handles that , maybe you can open different accounts but I'am totally not sure.
In index.php of template, someware below BODY tag:
<?php
$lang = JFactory::getLanguage();
if($lang->getTag() == "en-GB"){ ?>
<!-- HERE GOES CODE SNIPPET FOR ENGLISH -->
<?php } else if($lang->getTag() == "fr-FR"){ ?>
<!-- HERE GOES CODE SNIPPET FOR FRANCH -->
<?php } else if($lang->getTag() == "de-DE"){ ?>
<!-- HERE GOES CODE SNIPPET FOR GERMAN -->
<?php } ?>