Merge branch '3.4' into 4.4

* 3.4:
  [Yaml] fix dumping strings containing CRs
  [DI] Fix XmlFileLoader bad error message
  Tweak message
  improve PlaintextPasswordEncoder docBlock summary
  [Validator] Add two missing translations for the Arabic (ar) locale
  Use some PHP 5.4 constants unconditionally
  Revert "bug symfony#28179 [DomCrawler] Skip disabled fields processing in Form"
  Add Spanish translation
  Fix typo
  [Validator] add Japanese translation
  Fix typo
  Add Polish translation
  [SecurityBundle] Minor fixes in configuration tree builder
  bumped Symfony version to 3.4.39
  updated VERSION for 3.4.38
  update CONTRIBUTORS for 3.4.38
  updated CHANGELOG for 3.4.38

Author: nicolas-grekas

FormRenderer.php

@@ -293,9 +293,9 @@ public function humanize($text)
     public function encodeCurrency(Environment $environment, string $text, string $widget = ''): string
     {
         if ('UTF-8' === $charset = $environment->getCharset()) {
-            $text = htmlspecialchars($text, ENT_QUOTES | (\defined('ENT_SUBSTITUTE') ? ENT_SUBSTITUTE : 0), 'UTF-8');
+            $text = htmlspecialchars($text, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
         } else {
-            $text = htmlentities($text, ENT_QUOTES | (\defined('ENT_SUBSTITUTE') ? ENT_SUBSTITUTE : 0), 'UTF-8');
+            $text = htmlentities($text, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
             $text = iconv('UTF-8', $charset, $text);
             $widget = iconv('UTF-8', $charset, $widget);
         }