Merge branch '4.4' into 5.2

* 4.4:
  Update translations for Norwegian Nynorsk (nn) #38756
  Fix eventListener initialization when eventSubscriber constructor dispatch an event
  clear unchecked choice radio boxes even if clear missing is set to false
  [ErrorHandler] Added missing type annotations to FlattenException
  [TwigBridge] Allow version 3 of the Twig extra packages
  Fix FrameworkBundle PropertyAccess definition when not in debug

Author: derrabus

ContainerAwareEventManager.php

@@ -177,6 +177,7 @@ private function initializeSubscribers()
             if (!isset($this->listeners[$event])) {
                 $this->listeners[$event] = [];
             }
+            unset($this->initialized[$event]);
             $this->listeners[$event] += $listeners;
         }
         $this->subscribers = [];