[FIX] base: in `res.lang`, invalidate `ormcache` after modifying languages
[FIX] base: in `res.lang`, invalidate `ormcache` after modifying languages

The method `write` calls `env['res.lang']._get_installed`, which is ormcached.
After activating a language with `write`, one must invalidate the ormcache.

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