Index: babel.py
===================================================================
--- babel.py	(wersja 358)
+++ babel.py	(kopia robocza)
@@ -13,6 +13,7 @@
 
 from django.conf import settings
 from django.template import Library
+from django.utils.translation import to_locale
 try:
     from pytz import timezone
 except ImportError:
@@ -29,7 +30,7 @@
 def _get_format():
     locale = get_current_locale()
     if not locale:
-        locale = Locale.parse(settings.LANGUAGE_CODE)
+        locale = Locale.parse(to_locale(settings.LANGUAGE_CODE))
     if timezone:
         tzinfo = timezone(settings.TIME_ZONE)
     else: