Александр Макаров

namespace app\components;

use Twig_Extension;
use Twig_Extensions_TokenParser_Trans;
use Twig_SimpleFilter;

class Twig_I18n_Extension extends Twig_Extension {

	/**
	 * Translation message context
	 * @var string
	 */
	public $category = 'app';

	/**
	 * Returns the token parser instances to add to the existing list.
	 *
	 * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
	 */
	public function getTokenParsers()
	{
		return array(new Twig_Extensions_TokenParser_Trans());
	}

	/**
	 * {@inheritdoc}
	 */
	public function getFilters()
	{
		return array(
			new \Twig_SimpleFilter('trans', array($this, 'trans')),
		);
	}


	/**
	 * @param string $category the message category.
	 * @param string $message the message to be translated.
	 * @param array $arguments
	 * @param string $language the language code (e.g. `en-US`, `en`). If this is null, the current
	 * [[\yii\base\Application::language|application language]] will be used.
	 * @return string
	 */
	public function trans($message, array $arguments = [], $category = null, $language = null)
	{
		if (!$category) {
			$category = $this->category;
		}
		return \Yii::t($category, $message, $arguments, $language);
	}

	/**
	 * Returns the name of the extension.
	 *
	 * @return string The extension name
	 */
	public function getName()
	{
		return 'i18n';
	}
}

'view' => [
		    'renderers' => [
			    'twig' => [
				    'class' => 'yii\twig\ViewRenderer',
				    'extensions' => [
					    'app\components\Twig_I18n_Extension'
				    ],
			    ],
		    ],
	    ],

function actionView($path) {
    // это пример. Все зависит от архитектуры
    $category = Category::findByPath($path);
}