Merge branch '4.4'

* 4.4: (30 commits)
  fix merge
  fix merge
  [HttpClient] fix debug output added to stderr at shutdown
  fix cs
  [Mailer] fixed logic
  fixed missing license
  Add a new ErrorHandler component (mirror of the Debug component)
  Use mocks before replacing the error handler
  [Config] Do not use absolute path when computing the vendor freshness
  [Process] Path resolution for FCGI configuration
  Bump minimum version of symfony/phpunit-bridge
  Container*::getServiceIds() should return an array of string
  [Config][ReflectionClassResource] Use ternary instead of null coaelscing operator
  [Validator] Add missing Russian and Ukrainian translations
  [Translation] Use HTTPS and fix a url
  [Config] Fix for signatures of typed properties
  [Validator] Add missing Hungarian translations
  [Validator] Add Lithuanian translation for Range validator
  Add HTTPS to a URL
  sync translation files
  ...

Loader/PoFileLoader.php

@@ -12,15 +12,15 @@
 namespace Symfony\Component\Translation\Loader;
 
 /**
- * @copyright Copyright (c) 2010, Union of RAD http://union-of-rad.org (http://lithify.me/)
+ * @copyright Copyright (c) 2010, Union of RAD https://github.com/UnionOfRAD/lithium
  * @copyright Copyright (c) 2012, Clemens Tolboom
  */
 class PoFileLoader extends FileLoader
 {
     /**
      * Parses portable object (PO) format.
      *
-     * From http://www.gnu.org/software/gettext/manual/gettext.html#PO-Files
+     * From https://www.gnu.org/software/gettext/manual/gettext.html#PO-Files
      * we should be able to parse files having:
      *
      * white-space