How to translate month?

I have this date 3/2021, and I'm trying to translate March into "Marzo", so I did:

PHP Code:

<?= DateTime::createFromFormat('m-Y', $d->date)->format(lang('date.month', ['F']) . '/Y') ?>

locale file:

PHP Code:

<?php

$months = [
    'March' => 'Marzo'
];

return [
    'month' => "{0}"
]; 


how can I show "Marzo"?