I have installed the plugin and have set the language to Dutch. In Google Chrome and Internet Explorer everything is ok. In Firefox I still got the English 'Like' button instead of the Dutch 'Vind ik leuk' version.
When I clear my cookies and cache in Firefox, it is okay. But about an half hour later, on a restart of the browser, the button again has changed to the English version.
1. How can this happen?
2. How can I change this?