Replace 'normalize' parameter of _translate_dict() with a hook method
This parameter was only used to execute extra code before
normalize_translation
is called. This caused some duplication, and
will not work when switching to a non-JSON-LD internal representation.
Removing it also makes the code of mappings more consistent, by removing
specific field handling from their implementation of the translate
method itself.
Depends on !367 (closed).
Migrated from D8275 (view on Phabricator)