Bug 1069915 - Privacy Panel

This is a new pull regrets for the Privacy Panel. I am very sorry to open another pull request instead of reopening the old one, but before I thought twice I have deleted my mold branch and had to reopen everything from the beginning. 
Remember to add test for this item, you can check : 
https://github.com/mozilla-b2g/gaia/blob/master/apps/settings/test/unit/panels/root/airplane_mode_item_test.js
https://github.com/mozilla-b2g/gaia/blob/master/apps/settings/test/unit/panels/root/language_item_test.js