Django messages framework - lack of i18n by default - django

Question

By default django messages framework does not localize it's messages correctly.
For example in admin interface
As you can see all other things in admin panel are localized. The translation file exists. Here is my settings.
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
...
]
MIDDLEWARE = [
'debug_toolbar.middleware.DebugToolbarMiddleware',
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.locale.LocaleMiddleware',
]
LANGUAGE_CODE = 'ru' # I've tried 'ru-RU'
TIME_ZONE = 'Europe/Moscow'
USE_I18N = True
USE_L10N = True
USE_TZ = True
How to fix this? Thanks in advance. I have django version 3.0.6. This error also is absent in django 1.8

Answer 1

It was a breaking change from django/django#42b9a23 (Django 3.0+) that only updated the French translations.
You can patch DjangoTranslation.gettext to handle the smart quotes.
def _patch_gettext():
from django.utils.translation.trans_real import DjangoTranslation
_gettext = DjangoTranslation.gettext
def gettext(self, message):
text = _gettext(self, message)
if text is message and '“' in message:
new_message = message.replace('“', '"').replace('”', '"')
new_text = _gettext(self, new_message)
if new_text is not new_message:
return new_text
return text
DjangoTranslation.gettext = gettext
About patching
Subclass AppConfig in mysite/apps.py:
from django.apps import AppConfig
class MySiteAppConfig(AppConfig):
name = 'mysite'
def ready(self):
_patch_gettext()
Put the dotted path to that subclass in INSTALLED_APPS in mysite/settings.py:
INSTALLED_APPS = [
...
'mysite.apps.MySiteAppConfig',
]
Reference: https://docs.djangoproject.com/en/3.0/ref/applications/#configuring-applications