[FIX] website: fix editor not starting after creating a website

Commit [1] introduced an automatic start of edit mode when
selecting a theme but didn't take into account wether the frontend lang
of the user was matching that of the website that is supposed to enter
in edit mode.

Steps to reproduce:
- Create an empty database and install website.
- Add an extra lang on website (e.g FR) and visit the website in that
lang.
- Go in settings an create a new website, skiper the configurator,
  select a theme.
- Redirect is with enable_editor but nothing happens.

The editor isn't started if not in the source's lang.

This commit redirect the user to the default_lang of the website
so that editor can always be started. It also introduces a tour
to test out the flow.

[1]: https://github.com/odoo/odoo/commit/f474eac4543712ae5b1c7d614f9eff9367445107

task-2687416

closes odoo/odoo#85058

X-original-commit: 02e08af7278cd66d768fe6a4f23aa17eb816be3c
Signed-off-by: Romain Derie (rde) <rde@odoo.com>

addons/website/models/website.py

@@ -1281,6 +1281,9 @@ class Website(models.Model):
     def button_go_website(self, path='/', mode_edit=False):
         self._force()
         if mode_edit:
+            # If the user gets on a translated page (e.g /fr) the editor will
+            # never start. Forcing the default language fixes this issue.
+            path = url_for(path, self.default_lang_id.url_code)
             path += '?enable_editor=1'
         return {
             'type': 'ir.actions.act_url',