Impacted versions:
9.0, 10.0

Steps to reproduce:

Create a new database with language English by default and add a new language. Go to settings->translate->languages (in debug mode), inactive English. Go to contacts and "Create". 

Related: https://github.com/odoo/odoo/issues/3854

Current behavior:

Frontend error: Try read en_US language and add to partner, but this not are avalaible.

Expected behavior:
Change default language for all partners.

I need change the default value manually for create new partners:
```
UPDATE public.ir_values
   SET value='S''es_CO''
p1
.'
 WHERE id=1;
```

Video/Screenshot link (optional):


odoo/addons/base/res/res_lang.py
import json
import locale
import logging
import re
from operator import itemgetter
from odoo import api, fields, models, tools, _
from odoo.tools.safe_eval import safe_eval
from odoo.exceptions import UserError, ValidationError
_logger = logging.getLogger(__name__)
DEFAULT_DATE_FORMAT = '%m/%d/%Y'
DEFAULT_TIME_FORMAT = '%H:%M:%S'
class Lang(models.Model):
    _name = "res.lang"