Django: exception in get_catalog()

I have a limited set of LANGUAGES:

LANGUAGE_CODE='sl' # It's for locals first of all
LANGUAGES=[
    ('sl', _('Slovene')), # First is default
    ('en', _('English')),
    ('it', _('Italian')),
    ('de', _('German')),
    ('ru', _('Russian')),
]

But not everything is translated, mainly they're to have additional fields for django_modeltranslation. I've added this line to see what's happening right after "while True" in django/views/i18n.py:get_catalog():

print(translation, translation._fallback)

For en_US value in accept_language header, all is fine:

<DjangoTranslation lang:en> <gettext.GNUTranslations object at 0x7f07f59cb070>
<gettext.GNUTranslations object at 0x7f07f59cb070> <gettext.GNUTranslations object at 0x7f07f59cb0e0>
<gettext.GNUTranslations object at 0x7f07f59cb0e0> None

For sl_SI all is good as well:

<DjangoTranslation lang:sl> None

But for de_DE (or ru_RU) it crashes:

<DjangoTranslation lang:de> <DjangoTranslation lang:sl>
<DjangoTranslation lang:sl> <django_countries.EmptyFallbackTranslator object at 0x7f07f6ccbcb0>
<django_countries.EmptyFallbackTranslator object at 0x7f07f6ccbcb0> None
Internal Server Error: /jsi18n/
Traceback (most recent call last):
  File "/home/pooh/venv13/lib/python3.13/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "/home/pooh/venv13/lib/python3.13/site-packages/django/core/handlers/base.py", line 198, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/pooh/venv13/lib/python3.13/site-packages/django/views/generic/base.py", line 106, in view
    return self.dispatch(request, *args, **kwargs)
           ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pooh/venv13/lib/python3.13/site-packages/django/views/generic/base.py", line 145, in dispatch
    return handler(request, *args, **kwargs)
  File "/home/pooh/venv13/lib/python3.13/site-packages/django/views/i18n.py", line 124, in get
    context = self.get_context_data(**kwargs)
  File "/home/pooh/venv13/lib/python3.13/site-packages/django/views/i18n.py", line 210, in get_context_data
    "catalog": self.get_catalog(),
               ~~~~~~~~~~~~~~~~^^
  File "/home/pooh/venv13/lib/python3.13/site-packages/django/views/i18n.py", line 187, in get_catalog
    for key, value in translation._catalog.items():
                      ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'EmptyFallbackTranslator' object has no attribute '_catalog'

Is it a problem with django codebase or I have a misconfiguration somewhere?

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