newsletter hardcoded email address, first, last name (i18n issues)

[ss23]

From http://open.silverstripe.org/ticket/4669

• newsletter-trunk-r88195
• userforms-trunk-r90643 if changing the label of the field "Email address" "First Name" "Last name" to change to other language, the submission crashes at

SubscribeFrom.php

$field = $obj_field_map[$editable->Title];

[Notice] Undefined index: "First name ddd" (ddd being added ;-) ) POST /restez-informes/Form

Line 189 in /home/www/660365d5f22429ae7b9568b2935920be/web/newsletter/code/SubscribeForm.php