Merge branch '3.4' into 4.3

* 3.4:
  Added the other two removed component articles to the redirection map

Author: wouterj

_build/redirection_map

@@ -476,3 +476,5 @@
 /components/debug https://github.com/symfony/debug
 /components/translation https://github.com/symfony/translation
 /components/translation/usage /translation
+/components/translation/custom_formats https://github.com/symfony/translation
+/components/translation/custom_message_formatter https://github.com/symfony/translation