Alloy product documentation is visible in the Notes and Domino Information Center in whatever language is set in your Web browser. For example, to display the documentation in French, open your Web browser and in the Language preference panel (or your browser's equivalent) click Add and choose French (fr). Remove whatever other language had been specified (or use other panel options to specify the new language) and then open or refresh the Alloy product documentation link - voila!
The available languages are:
Note that the embedded user help displays in the same language as the client UI and is based on locale and user preferences as documented.