1) Uh oh. You've found a language that Facebook doesn't support. That's a first. The Facebook JS file that we're trying to load below is coming up with an error:
connect.facebook.net/sr_YU/all.js
A list of the languages Facebook supports (in an XML file) are below. Forgive my lack of knowledge, but the closest language I could find in that file is:
sr_RS - Serbia
If that works, or you find another code that most closely matches your language, you'll have to make one minor code modification to force loading the correct Facebook language. In the file /components/com_jfbconnect/libraries/facebook.php, around line 66, you'll see a few statements about $locale. At the bottom of these, add the following:
$locale = "sr_RS"; (or whatever other language code seems to fit your case best.
Sorry for the inconvenience.
2) Each module has it's own on/off switch for the Powered by Facebook link. We'll be updating these in a future release to use the main control in the component.
Hope that helps get you on your way. Please let us know what you determine about the language setting.
Thanks!