Implement multi-tenant support, can have orders from multiple accounts in the same DB
_store_create_success: take language from create_payment() args

Not indirectly from shopper
Avoid creating <_id/> element in <shopper> when ID is missing
Simplify _store_create_success() arguments
Expose to_iso639_part1() in gateway API
Add DOCDATA_FACADE_CLASS setting, so all views use your custom Facade
Add manager methods: for_reference() / for_order()
Update CHANGELOG
views: remove unused OrderPlacementMixin