Symfony version(s) affected: 4.2.7

Description
Using form and validation components without translation component leads to Fatal error: Interface 'Symfony\Component\Translation\TranslatorInterface' not found in /var/www/framework/vendor/symfony/validator/Util/LegacyTranslatorProxy.php on line 21 when running composer install -o -a --no-dev

How to reproduce

• symfony new my_project
• cd my_project/
• composer req symfony/validator

neither on official documentation or component composer.json shows a direct dependency from the translator component.