Extract translations and preparation to setup of TestTemplate class. That way those are usable in other tests. Create a new model to test language computation. It holds both a string and a partner field, allowing to test a bit jinja-based language computation. Task-2643750 X-original-commit: 7896cbc4f2256122b5cf6c5506921398f2ebc931 Part-of: odoo/odoo#76458