[FIX] website: Update default language when removing current default
[FIX] website: Update default language when removing current default

Purpose
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Steps to reproduce:

Remove current default language of your website, it doesn't change the default language which makes the website crashing on edition.

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