This patch adds some support for Javascript localization, by means of the same Localization plugin and the same translation file. One should only create entries in the translation file with a 'js_' prefix, like this:

l.store 'js_hours', 'ore'

and then, provided there's an HTML reference to the Javascript in /articles/localized_js (like I've provided in the attached patch for the default.rhtml of the default theme), one can localize strings in Javascript like this:

document.write( 'Hello!'.localize() );