How to use e-Newsletter with WPML multilanguage websites

I'd like to use e-Newsletter plugin on a WPML multilanguage website.
People subscribing to the newsletter have to be automatically affected to a specific group by Language.

If a user is surfing on my website in French by example, if he's subscribing to my newsletter, i have to know that he subscribed in French. I will be able to write him in the future in his language.

All messages during subscription process have to be in the desire language.

Message in newsletter (unsubscribe link). Have also to be in the user language.

Thanks for your anwser.