Merge branch '3.4' into 4.3

* 3.4:
  [Intl] Update the ICU data to 65.1
  [VarDumper] fix dumping uninitialized SplFileInfo
  Added missing translations.
  Fixed invalid VarDumper upgrade doc.
  [HttpFoundation] Check if data passed to SessionBagProxy::initialize is an array
  Don't let falsey usernames slip through

Author: nicolas-grekas

Session/Storage/NativeSessionStorage.php

@@ -458,7 +458,7 @@ protected function loadSession(array &$session = null)
 
         foreach ($bags as $bag) {
             $key = $bag->getStorageKey();
-            $session[$key] = isset($session[$key]) ? $session[$key] : [];
+            $session[$key] = isset($session[$key]) && \is_array($session[$key]) ? $session[$key] : [];
             $bag->initialize($session[$key]);
         }