snapshot: preserve bilingual core UI and gettext workflow state

backend/config/settings.py

@@ -38,6 +38,7 @@ INSTALLED_APPS = [
 MIDDLEWARE = [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.locale.LocaleMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
@@ -83,7 +84,12 @@ AUTH_PASSWORD_VALIDATORS = [
     {'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator'},
 ]
 
-LANGUAGE_CODE = 'de-de'
+LANGUAGE_CODE = os.getenv('DJANGO_LANGUAGE_CODE', 'de')
+LANGUAGES = [
+    ('de', 'Deutsch'),
+    ('en', 'English'),
+]
+LOCALE_PATHS = [BASE_DIR / 'locale']
 TIME_ZONE = 'Europe/Berlin'
 USE_I18N = True
 USE_TZ = True