Merge branch '6.4' into 7.4

* commit 'e50a4e79b65':
  [HttpKernel] Fix the log level of exceptions mapped to an HTTP status code
  [Serializer] Fix the cache key of MetadataAwareNameConverter when the context can't be serialized
  [Translation] Updating and improving Albanian translations
  [Validator] Review Arabic translations
  [FrameworkBundle] Disable HTTP/2 push on the default HTTP client
  [Validator] Review Albanian translations

# Conflicts:
#	src/Symfony/Component/HttpKernel/EventListener/ErrorListener.php