Plumi has built in support for internationalisation based on the LinguaPlone project, this adds the ability to translate the website into other languages. Translations must have been contributed, and languages must have been enabled by site administrators for this function to be available.
To select another available language, click the flag corresponding to that national language (here we click the French flag, to change the site language to French).
Here you can see that most of the interface is translated already into French. But only some of the content has been translated into French (Plumi depends on users to translate content, rather than machine translation).