I understand the comment plugin is important. We have a minor bug fix release due out this weekend, and if we can get the plugin going, we'll have it out then too. If not, it should be out by next week.
As for the language settings, if you'd like to manually update it right now, you can do the following. We'll be making JFBConnect detect what language you've selected in Joomla and use that in the future. If that's not good, or you have a different suggestion on how language should be selected, please let us know!
Edit the /components/com_jfbconnect/libraries/facebook.php file. At ~line 75, update the line below with your country code:
<script src="//connect.facebook.net/en_US/all.js"></script>
For Italian (think that's your language), it would be /it_IT/all.js