Merge branch '3.3' into 3.4

* 3.3:
  fixed some deprecation messages
  fixed some deprecation messages
  fixed some deprecation messages
  fixed some deprecation messages
  [2.7][DX] Use constant message contextualisation for deprecations

Author: fabpot

Dumper/FileDumper.php

@@ -75,7 +75,7 @@ public function dump(MessageCatalogue $messages, $options = array())
             $fullpath = $options['path'].'/'.$this->getRelativePath($domain, $messages->getLocale());
             if (file_exists($fullpath)) {
                 if ($this->backup) {
-                    @trigger_error('Creating a backup while dumping a message catalogue is deprecated since version 3.1 and will be removed in 4.0. Use TranslationWriter::disableBackup() to disable the backup.', E_USER_DEPRECATED);
+                    @trigger_error('Creating a backup while dumping a message catalogue is deprecated since Symfony 3.1 and will be removed in 4.0. Use TranslationWriter::disableBackup() to disable the backup.', E_USER_DEPRECATED);
                     copy($fullpath, $fullpath.'~');
                 }
             } else {