How can I display months in French ? Symfony 6.0.2 - symfony

Question

I built a registration form in Symfony. I am asking for date of birth to my user. I'd like to know how I can display months in French (or other languages). At the moment they are displayed in English. I posted code on UserType.php. I am thinking maybe I have to add something in it but I have no clue.
How can I display months in French ?
Thank you.
UserType.php
<?php
namespace App\Form;
use App\Entity\User;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\CallbackTransformer;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\Extension\Core\Type\CountryType;
use Symfony\Component\Form\Extension\Core\Type\BirthdayType;
use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
use Symfony\Component\Form\Extension\Core\Type\LanguageType;
use Symfony\Component\Form\Extension\Core\Type\PasswordType;
use Symfony\Component\Form\Extension\Core\Type\RepeatedType;
class UserType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options): void
{
$builder
->add('gender', ChoiceType::class, [
'choices' => [
'Je suis ...' => '',
'un homme' => 'male',
'une femme' =>'female',
'non-binaire' => 'non-binary'
]
])
->add('lastname')
->add('firstname')
->add('birthdate', BirthdayType::class, [
'placeholder' => [
'year' => 'Année', 'month' => 'Mois', 'day' => 'Jour',
],
])
->add('occupation')
->add('nationality', CountryType::class, [
'placeholder' => 'Choisis un pays',
])
->add('nativelanguage', LanguageType::class, [
'placeholder' => 'Choisis ta langue maternelle',
])
->add('wishedlanguages', LanguageType::class, [
'placeholder' => 'Choisis une langue étrangère',
])
->add('email')
->add('password', PasswordType::class, [
'mapped' => false
])
->add('password', RepeatedType::class, [
'type' => PasswordType::class,
'invalid_message' => 'Les deux mots de passe doivent être identiques.',
'options' => ['attr' => ['class' => 'password-field']],
'required' => true,
'first_options' => ['label' => 'Password'],
'second_options' => ['label' => 'Repeat Password'],
])
->add('roles', CheckboxType::class, [
'label' => 'Je m\'inscris uniquement en tant qu\'organisateur.',
'required' => false,
'compound' => true,
])
->get('roles')
->addModelTransformer(new CallbackTransformer(
function ($arrayAsBool) {
return in_array("ROLE_ADMIN", $arrayAsBool);
},
function ($boolAsArray) {
return $boolAsArray ? ["ROLE_ADMIN"] : ["ROLE_USER"];
}))
->add('Subcription', SubmitType::class);
;
}
public function configureOptions(OptionsResolver $resolver): void
{
$resolver->setDefaults([
'data_class' => User::class,
]);
}
}

Answer 1

The BirthdayType supports choice_translation_domain, set this to true.
->add('birthdate', BirthdayType::class, [
'placeholder' => [
'year' => 'Année', 'month' => 'Mois', 'day' => 'Jour',
],
'choice_translation_domain' => true
])
Update your defaults to set the translation domain name.
public function configureOptions(OptionsResolver $resolver): void
{
$resolver->setDefaults([
'data_class' => User::class,
'translation_domain' => 'forms' // Call it what you like
]);
}
Then create a translation file, eg: translations/forms.fr.yaml. This filename is referencing the translation_domain above.
# translations/forms.fr.yaml
Jan: Janvier
Feb: Février
Mar: Mars
...
...
The language locale fr for example, is set in the users request i believe, so you can have as many language translations as you would like. So forms.de.yaml, forms.es.yaml etc.. and wherever the user is coming from, if the translation matches it will use it.