[REV] base: allow 'render' override with new api
[REV] base: allow 'render' override with new api

Using a frozendict as context breaks the `t-lang` mechanism, as
the `loader` is not aware of the changes of a copied frozendict
and thus is still using the values from the original context,
including the lang one.

This reverts commit e1deae7eab8be77d7bcb46a68560b86ffbb2277a.

dfang/odoo,laslabs/odoo,hip-odoo/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,storm-computers/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,dfang/odoo,laslabs/odoo,microcom/odoo,microcom/odoo,dfang/odoo,storm-computers/odoo,dfang/odoo,ygol/odoo,Elico-Corp/odoo_OCB,dfang/odoo,laslabs/odoo,microcom/odoo,storm-computers/odoo,dfang/odoo,ygol/odoo,microcom/odoo,bplancher/odoo,ygol/odoo,hip-odoo/odoo,bplancher/odoo,microcom/odoo,ygol/odoo,ygol/odoo,laslabs/odoo,bplancher/odoo,laslabs/odoo,laslabs/odoo,storm-computers/odoo,ygol/odoo,storm-computers/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,storm-computers/odoo,hip-odoo/odoo,bplancher/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,microcom/odoo