mail role language

The rule to send a mail to every user of a particular role is very cool.

However, I am on a multilingual site, and the language of the mail should change depending on the language preference of that user.

I thought of having one dedicated role per language and send a single language mail for each of these roles. I think that would work rather nicely, apart from the ballast of the need of multiple roles for this purpose. Each rule would simply have its own, single language, untranslated mail contents.