private function configureSourceLocale()
    {
        $em = $this->app->make(EntityManager::class);
        /* @var EntityManager $em */
        $repo = $this->app->make(LocaleRepository::class);
        if ($repo->findOneBy(['isSource' => true]) === null) {
            $locale = LocaleEntity::create('en_US');
            $locale
                ->setIsApproved(true)
                ->setIsSource(true)
            ;
            $em->persist($locale);
            $em->flush($locale);
        }
    }