[BUGFIX] Translated mailform should use localized email

In case mailforms are translated the email adress from the
translated record is ignored.

Change-Id: I184e7b96fe5a0405e3bed6546d4461cd44282ed6
Fixes: #17061
Releases: 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/7817
Reviewed-by: Stefan Rotsch
Tested-by: Stefan Rotsch
Reviewed-by: Thomas Layh
Tested-by: Thomas Layh
Reviewed-by: Wouter Wolters
Reviewed-by: Tolleiv Nietsch
Tested-by: Tolleiv Nietsch