Steps to reproduce the bug:
- Let's consider a new instance with default installed language 'en_US'
- Install CRM
- Activate a second language (e.g. en_GB)
- Set that language in all users
- Inactivate default language 'en_US'
- Reset the language of your current user (no value)
- Go to contact and try to create a new one
Bug:
A traceback was raised because the lang en_US did not exist.
PS: Forcing the user to set a language ensures that this fallback
will never occur anymore.
opw:2267711
closesodoo/odoo#53375
Signed-off-by: Simon Goffin (sig) <sig@openerp.com>