Do not use the model `_description` field which cannot be translated. Use
the `display_name` of the corresponding model instead.
Moreover, `<t t-esc="'%s' % model_description or 'document'"/>` gives
`'None'`, while `'document'` is expected.
This adds a query to some tests, which is expected since `display_name`
requires information stored in the DB, while `_description` is defined
at the Python level.
opw-1908420