[FIX] auth_signup: prevent crash if http_routing not installed

Follow up of 269aa594111a152ad4b7714856ea745bfef57155

`request.lang` is only set on `http_routing` so it cannot be used here.

The fix here is the same as what was done on `web` on the mentioned commit.

To reproduce the issue:
- install any module, but not `http_routing`
- use reset password
- try to set a new password from the received link with token

A few notes about the mentioned commit:
- the `lang` `lazy_property` was removed because it was a string before and a
  record now, and lazy_property cannot return a record
- the `lang` on the `request` is now a record
- the `lang` on the `context` is still a string

closes odoo/odoo#36468

Signed-off-by: Romain Derie (rde) <rde@odoo.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/addons/auth_signup/controllers/main.py b/addons/auth_signup/controllers/main.py
index 6f21118e369..986278e2ab3 100644
--- a/addons/auth_signup/controllers/main.py
+++ b/addons/auth_signup/controllers/main.py
@@ -124,8 +124,9 @@ class AuthSignupHome(Home):
         if values.get('password') != qcontext.get('confirm_password'):
             raise UserError(_("Passwords do not match; please retype them."))
         supported_lang_codes = [code for code, _ in request.env['res.lang'].get_installed()]
-        if request.lang.code in supported_lang_codes:
-            values['lang'] = request.lang.code
+        lang = request.context.get('lang', '').split('_')[0]
+        if lang in supported_lang_codes:
+            values['lang'] = lang
         self._signup_with_values(qcontext.get('token'), values)
         request.env.cr.commit()