How to set back-end language per user?

I would like to use the english interface for the back-end but I would like to set it to native language for an editor. I know WPML has this feature, but I don’t want to install the unsupported WPML just for this reason.

What I am looking is a tiny plugin which gives a switchbox for the user profile page for setting the back-end language. Is there such a plugin?

Have you seen
http://wordpress.org/extend/plugins/wp-native-dashboard/?

I think it does exactly what you are asking.

Also ‘interesting’ is http://wordpress.org/extend/plugins/in-their-language/ which attempts to set the locale automatically based n browser settings.