Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/translation/README.md

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+Translation Component
+=====================
+
+Translation provides tools for loading translation files and generating
+translated strings from these including support for pluralization.
+
+```php
+use Symfony\Component\Translation\Translator;
+use Symfony\Component\Translation\MessageSelector;
+use Symfony\Component\Translation\Loader\ArrayLoader;
+
+$translator = new Translator('fr_FR', new MessageSelector());
+$translator->setFallbackLocales(array('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/silexphp/Silex/blob/master/src/Silex/Provider/TranslationServiceProvider.php
+
+Documentation:
+
+https://symfony.com/doc/2.7/book/translation.html
+
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/Translation/
+    $ composer install
+    $ phpunit