Switching web page languages - how?

Is there support to somehow automate the localization of web pages in Rails? I need to create an application that must allow the user to dynamically switch between several languages -- luckily, all of them left-to-right languages.

Most guides and books do not even mention that issue and assume everyone is using English. Are there any guides or documentation about how to best do this?

Have a look at: http://raa.ruby-lang.org/project/ruby-gettext/

Isak