Merge branch '6.4' into 7.2

* 6.4:
  Minor tweaks
  Explain how translation messages are merged among bundles

Author: javiereguiluz

translation.rst

@@ -502,7 +502,9 @@ Symfony looks for message files (i.e. translations) in the following default loc
   ``Resources/translations/`` directory, which is no longer recommended for bundles).
 
 The locations are listed here with the highest priority first. That is, you can
-override the translation messages of a bundle in the first directory.
+override the translation messages of a bundle in the first directory. Bundles are
+processed in the order in which they are listed in the ``config/bundles.php`` file,
+so bundles appearing earlier have higher priority.
 
 The override mechanism works at a key level: only the overridden keys need
 to be listed in a higher priority message file. When a key is not found