Subscribe Confirmation Translations

Hi,
I have a site in 3 languages (english, german and spanish) translated with WPML.
Every language has his own domain (my site.com = english, my site.de = german, my site.es = spanish).

I have a couple of questions:

1) How do I translate the Confirmation message in the Subscribe Forms builder?

2) I see that when you create a newsletter there are no translation fields for the subject and message, so I suppose I will have to create a newsletter for every language (very tedious). Any workaround?

3) To send the localized newsletter, I would have to store the language of the subscriber in a custom field, according to the domain used by the visitor to subscribe. How I do that?

Thanks

Best