How to add class to a language field? In drupal 7 there is a field which displays the node`s language. 

I have a multi-site installation and plenty of content types on each of sites. I don`t want to click for hours hiding this field. By default it is generated  with "form-item form-type-item" classes.

How could i add a class to this field to be able to hide it in css?

Thanks
The easiest way to do that in my situation was just adding to node.tpl:

hide($content['language']);