collection-crud/config/packages/translation.php

<?php declare(strict_types=1);

use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;

return static function (ContainerConfigurator $containerConfigurator): void {
    $containerConfigurator->extension('framework', [
		'default_locale' => 'en',
		'translator' => [
			'default_path' => '%kernel.project_dir%/translations',
			'fallbacks' => ['%locale%']
		]
	]);
};