I\'m trying to use the validation attributes in \"language > {language} > validation.php\", to replace the :attribute name (input name) for a proper to read name (example: f
The :attribute can only use the attribute name (first_name in your case), not nice names.
But you can define custom messages for each attribute+validation by definine messages like this:
$messages = array(
'first_name_required' => 'Please supply your first name',
'last_name_required' => 'Please supply your last name',
'email_required' => 'We need to know your e-mail address!',
'email_email' => 'Invalid e-mail address!',
);