Fixes an issue where duplicating documents in Postgres / SQLite would
crash because of a foreign key constraint / unique ID issue when you
have nested arrays / blocks within localized arrays / blocks.
We now run `beforeDuplicate` against all locales prior to
`beforeValidate` and `beforeChange` hooks.
This PR also fixes a series of issues in Postgres / SQLite where you
have localized groups / named tabs, and then arrays / blocks within the
localized groups / named tabs.