STEPS: * create fresh db with default lang fr_CH * install website * activate additional language, e.g. en_GB * set for website only one available language: fr_CH * for admin user set lang en_GB * open website and add form BEFORE: the form doesn't work, because action url is "/en_GB/website_form/" AFTER: action url is not changed WHY: 1. ``is_multilang_url`` returns ``True``, because there is no route ``/website_form/`` https://github.com/odoo/odoo/blob/0adcb9a09fe5714fe8479df9450ddcefa7ba0688/addons/http_routing/models/ir_http.py#L233-L244 2. Model name in action is added after rendering only, this is why ``is_multilang_url`` is called with ``/website_form/`` and not real url https://github.com/odoo/odoo/blob/0adcb9a09fe5714fe8479df9450ddcefa7ba0688/addons/website_form/static/src/js/website_form.js#L144 3. As result we get error on trying to make request ``/en_GB/website_form/mail.mail`` --- opw-2413960 closes odoo/odoo#64016 X-original-commit: e9e86e251b7e262c4fe9c71722c27cc69cc3b712 Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>