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

vendor/symfony/translation/CHANGELOG.md

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+CHANGELOG
+=========
+
+2.7.0
+-----
+
+ * added DataCollectorTranslator for collecting the translated messages.
+
+2.6.0
+-----
+
+ * added possibility to cache catalogues
+ * added TranslatorBagInterface
+ * added LoggingTranslator
+ * added Translator::getMessages() for retrieving the message catalogue as an array
+
+2.5.0
+-----
+
+ * added relative file path template to the file dumpers
+ * added optional backup to the file dumpers
+ * changed IcuResFileDumper to extend FileDumper
+
+2.3.0
+-----
+
+ * added classes to make operations on catalogues (like making a diff or a merge on 2 catalogues)
+ * added Translator::getFallbackLocales()
+ * deprecated Translator::setFallbackLocale() in favor of the new Translator::setFallbackLocales() method
+
+2.2.0
+-----
+
+ * QtTranslationsLoader class renamed to QtFileLoader. QtTranslationsLoader is deprecated and will be removed in 2.3.
+ * [BC BREAK] uniformized the exception thrown by the load() method when an error occurs. The load() method now
+   throws Symfony\Component\Translation\Exception\NotFoundResourceException when a resource cannot be found
+   and Symfony\Component\Translation\Exception\InvalidResourceException when a resource is invalid.
+ * changed the exception class thrown by some load() methods from \RuntimeException to \InvalidArgumentException
+   (IcuDatFileLoader, IcuResFileLoader and QtFileLoader)
+
+2.1.0
+-----
+
+ * added support for more than one fallback locale
+ * added support for extracting translation messages from templates (Twig and PHP)
+ * added dumpers for translation catalogs
+ * added support for QT, gettext, and ResourceBundles