Can't switch language environment in Django

Question

I have file locale/es/LC_MESSAGES/django.mo (and .po), ran makemessages and compilemessages. Definitely all messages are translated

in settings.py have:

Answer 1

I use this in my settings :

TIME_ZONE = 'Europe/Paris'
LANGUAGE_CODE = 'fr-FR'
SITE_ID = 1
USE_I18N = True

So you should use something like 'es-ES'