Merge branch '4.4' into 5.0

* 4.4:
  Fix abstract method name in PHP doc block
  Various cleanups
  [HttpClient] fix issues in tests
  Fixes sprintf(): Too few arguments in form transformer
  [Console] Fix QuestionHelper::disableStty()
  [Validator] Use Mime component to determine mime type for file validator
  validate subforms in all validation groups
  Update Hungarian translations
  Add meaningful message when Process is not installed (ProcessHelper)
  [PropertyAccess] Fix TypeError parsing again.
  [TwigBridge] fix fallback html-to-txt body converter
  [Form] add missing Czech validators translation
  [Validator] add missing Czech translations
  never directly validate Existence (Required/Optional) constraints

Transport/Smtp/Stream/SocketStream.php

@@ -135,7 +135,7 @@ public function initialize(): void
         $streamContext = stream_context_create($options);
 
         set_error_handler(function ($type, $msg) {
-            throw new TransportException(sprintf('Connection could not be established with host "%s": '.$msg, $this->url));
+            throw new TransportException(sprintf('Connection could not be established with host "%s": ', $this->url).$msg);
         });
         try {
             $this->stream = stream_socket_client($this->url, $errno, $errstr, $this->timeout, STREAM_CLIENT_CONNECT, $streamContext);