public function preSetData(FormEvent $event)
{
$form = $event->getForm();
$type = $form->getConfig()->getOption('entry_type');
foreach ($this->definedLocalesCodes as $localeCode) {
if ($form->has($localeCode)) {
continue;
}
$required = $localeCode === $this->defaultLocaleCode;
$form->add($localeCode, $type, ['required' => $required]);
}
}