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