Idea para solucionar el problema de los plurales en castellano para Symfony.

AppKernel.php

use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Config\Loader\LoaderInterface;
use Doctrine\Common\Inflector\Inflector;

class AppKernel extends Kernel
{
    public function __construct($environment, $debug)
    { 
        Inflector::rules('singular', [
            '/(d|n|r|s)es$/i' => '\1\2',
            '/(sis)$/i' => '\1\2',
            '/([ti])a$/i' => '\1a',
        ]);
        
        ...