[2.3] Cleanup deprecations

Author: nicolas-grekas

composer.json

@@ -23,7 +23,7 @@
     },
     "require-dev": {
         "symfony/form": "~2.0,>=2.0.5",
-        "symfony/locale": "~2.0,>=2.0.5",
+        "symfony/intl": "~2.3",
         "symfony/routing": "~2.2",
         "symfony/validator": "~2.2",
         "doctrine/common": "~2.2",