Duplicate blocks + missing locales

The current dev version has 2 critical errors:

1. If you select "Create a block", always 2 block are generated because there is a typo in the code
2. If the drupal_http_request() for the FB locales fails, an empty cache blob is created and there is no way of re-request the locale list. I simple check in the patch privides a fix. If you are in this situation you have to delete the fb_social row in the cache table manually.