protected function addLoaderFile(string $file, string $locale = null): void
	{
		if ($this->loader === null) {
			$builder = $this->getContainerBuilder();

			$loader = $builder->getByType(LoaderFactory::class);
			$this->loader = $builder->getDefinition($loader);
		}
		$this->loader->addSetup('addFile', [$file, $locale]);
	}