user_mailman_register 6.x-1.3

New Features:
Set mailman user language according to the drupal user preferred language
#387522: German translation for user_mailman_register: by deshilachado.

Bug fixed:
#370262: No mail and Digest options not reflected in mailman: Added a mailman version option in the list configuration page. It's needed to correctly set it or digest and nomail subscriptions could not work
#358532: Problems when users change their subscription with mailman manager: Set password empty for new subscriptions