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

Command/ServerLogCommand.php

@@ -114,7 +114,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 continue;
             }
 
-            $this->displayLog($input, $output, $clientId, $record);
+            $this->displayLog($output, $clientId, $record);
         }
     }
 
@@ -141,7 +141,7 @@ private function getLogs($socket)
         }
     }
 
-    private function displayLog(InputInterface $input, OutputInterface $output, $clientId, array $record)
+    private function displayLog(OutputInterface $output, $clientId, array $record)
     {
         if ($this->handler->isHandling($record)) {
             if (isset($record['log_id'])) {