Localization: first stab

Instead of using iOS's default strings files as NSLocalizedString(),
I'm porting a subset of MediaWiki's message functionality, sort of
a hybrid of the PHP and JavaScript 'Message' classes.

Messages are read from JSON files, as with jquery.i18n.

Functionality for parameter replacement, plurals, gender, and grammar
remain incomplete.

Included English, bad French, and a QQQ descriptions file.