Merge branch '2.3' into 2.7

* 2.3:
  fix container cache key generation
  [Translation] Add resources from fallback locale
  [DependencyInjection] enforce tags to have a name
  [YAML] Refine the return value of Yaml::parse()

Author: fabpot

Tests/DependencyInjection/FrameworkExtensionTest.php

@@ -472,7 +472,7 @@ protected function createContainer(array $data = array())
 
     protected function createContainerFromFile($file, $data = array())
     {
-        $cacheKey = md5($file.serialize($data));
+        $cacheKey = md5(get_class($this).$file.serialize($data));
         if (isset(self::$containerCache[$cacheKey])) {
             return self::$containerCache[$cacheKey];
         }