To adjust the language of the Facebook Like Box, simply change the source path in the JavaScript initialization. You can display the box in German using the following code:
<script type="text/javascript">
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) {return;}
js = d.createElement(s); js.id = id; js.async = true;
js.src = "//connect.facebook.net/de_DE/all.js#xfbml=1&version=v2.0";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
</script>
To display the Facebook Like Box in English, use the following code (other languages can be configured in the same way by using the corresponding language/country codes):
<script type="text/javascript">
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) {return;}
js = d.createElement(s); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&version=v2.0";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
</script>
