facebook button in German (instead of Dutch)

Hi,
Under articles are the social buttons. But on my Dutch site the facebook button is in German. How can I change the button or the language on the button?

1.) Access your site's root via FTP.
2.) Use a text editor capable of UTF-8 encoding to open this file
3.) templates/[yourtemplate]/warp/js/warp.js
Search for

src="//connect.facebook.net/en_US/

and replace it by

src="//connect.facebook.net/nl_NL/
Save and close the file.

Thanks, that works.