Merge branch '3.4' into 4.3

* 3.4:
  [Filesystem] [Serializer] fixes English grammar typo
  [Monolog Bridge] Fixed accessing static property as non static.
  Improve Symfony description
  [Validator] Add Japanese translation
  Remove some unused methods parameters
  Avoid empty \"If-Modified-Since\" header in validation request
  [Validator] ConstraintValidatorTestCase: add missing return value to mocked validate method calls

Author: fabpot

Console/Descriptor/JsonDescriptor.php

@@ -167,7 +167,7 @@ protected function describeEventDispatcherListeners(EventDispatcherInterface $ev
      */
     protected function describeCallable($callable, array $options = [])
     {
-        $this->writeData($this->getCallableData($callable, $options), $options);
+        $this->writeData($this->getCallableData($callable), $options);
     }
 
     /**
@@ -315,7 +315,7 @@ private function getEventDispatcherListenersData(EventDispatcherInterface $event
         return $data;
     }
 
-    private function getCallableData($callable, array $options = []): array
+    private function getCallableData($callable): array
     {
         $data = [];