#23 Language Support for Newsletter & Adr

[vizzy]

add language support for forms and newsletters.

define available languages.
let user choose from active languages on subscribe or predefined.
forms, newsletters and addresses have a language reference.
language is checked to show messages at frontend (subscribe/unsubscribe) and mails to user.
compare language of newsletter with language in address record. optinally do not send mails to adr that do not match the language of th enewsletter!

etc.

more ideas?