[FrameworkBundle] Invalid composer ref fix

The composer.json was referencing a "symfony/translator" package
which does not exist.  This has been updated to use the
"symfony/translation" package.

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -22,7 +22,7 @@
         "symfony/http-kernel": "self.version",
         "symfony/routing": "self.version",
         "symfony/templating": "self.version",
-        "symfony/translator": "self.version",
+        "symfony/translation": "self.version",
         "doctrine/common": ">=2.1,<2.3-dev"
     },
     "recommend": {