Translation ready plugin

Hi,

I had the idea to create this kind of plugin since Mavericks is out. Seeing there is already one, it's best I contribute directly to it :)

I modified the strings in the plugin to be translation ready, and modified the plugin's text domain to be ready for languages packs coming up in WP ( see http://ottopress.com/2013/language-packs-101-prepwork/)

I also translated the plugin in french.