[FIX] web_editor: ready when translations ready
[FIX] web_editor: ready when translations ready

$('web_editor.base').ready() returns a deferred that:

- wait at least for $(document).ready()
- wait at least for require('web.ajax').loadXML()
- at most once starts translations configuration

But there is an issue since there is unexpectedly no reference to the
translations, whilst it should have also been ready when ready was
resolved.

This commit keep the reference so translations can be used after
$('web_editor.base').ready() is resolved as it was before 7dfdfa0103.

note: in 11.0 it should be solved with 29729769 (so fix is for [10,11[)

opw-804148
closes #22522

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo