fix social button for partage share_from

src/Muzich/CoreBundle/Resources/public/js/muzich.js

         $('div#share_from_content').append(elements);
         $('div#share_from_message').text(response.message);
         $('form[name="add"]').append($('<input type="hidden" name="shared_from_finished" id="shared_from_finished" value="1" />'));
+        refresh_social_buttons();
       }
       
       return true;