Merge branch '3.4' into 4.3

* 3.4:
  Update links to documentation
  [Validator] Add the missing translations for the Arabic (ar) locale
  ensure to expect no validation for the right reasons
  [PhpUnitBridge] Add test case for @expectedDeprecation annotation
  Update year in license files
  [Console][FormatterHelper] Use helper strlen statically and remove duplicated code
  Fix BC issue in phpDoc Reflection library
  [Translator] Performance improvement in MessageCatalogue and catalogue operations.

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2019 Fabien Potencier
+Copyright (c) 2004-2020 Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal