Allows backend users to set the language displayed in the back-end and front-end of your site. It also allows to translate pages and posts.
I could internationalize easily my website with this plugin. and it's free! :D
This plugin realy helped me out. Very useful and easy to use.
I love it because it reads automatically the languages installed in the site and each user registered on the site can select an own language. Also visitors can change the language during their visit using the switch created by the plugin.