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
"""
    res = []
    saved_count = len(l) 
    for count in counts:
        if not l:
            break
        if count == -1:
            break
        if count == 0:
            while l:
                res.append(l[:saved_count])
                l = l[saved_count:]
            break
        res.append(l[:count])
        l = l[count:]
        saved_count = count
    if l:
        res.append(l)
    return res
intersperse_pat = re.compile('([^0-9]*)([^ ]*)(.*)')
def intersperse(string, counts, separator=''):
    """
    See the asserts below for examples.
    """
    left, rest, right = intersperse_pat.match(string).groups()
    def reverse(s): return s[::-1]
    splits = split(reverse(rest), counts)
    res = separator.join(map(reverse, reverse(splits)))
    return left + res + right, len(splits) > 0 and len(splits) -1 or 0