Removed useless row id columns

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31231

This PR removes the ID columns from the Languages, Clear Cache and Searches list views (like has been done with all other list views).

#### Testing Instructions
Go to the Search component, the Language Manager and the Clear Cache manager, and see if the ID columns is successfully removed and everything there still works and looks ok.