Translation Component

Translation provides tools for loading translation files and generating translated strings from these including support for pluralization.

use Symfony\Component\Translation\Translator;
use Symfony\Component\Translation\MessageSelector;
use Symfony\Component\Translation\Loader\ArrayLoader;

$translator = new Translator('fr_FR', new MessageSelector());
$translator->setFallbackLocale('fr');
$translator->addLoader('array', new ArrayLoader());
$translator->addResource('array', array(
    'Hello World!' => 'Bonjour',
), 'fr');

echo $translator->trans('Hello World!') . "\n";

Resources

Silex integration:

https://github.com/fabpot/Silex/blob/master/src/Silex/Provider/TranslationServiceProvider.php

Unit tests:

https://github.com/symfony/symfony/tree/master/tests/Symfony/Tests/Component/Translation

Documentation:

http://symfony.com/doc/2.0/book/translation.html