setting TOWER_KEYWORDS to get _lazy extraction (bug 570109)

settings.py

@@ -80,6 +80,10 @@ LANGUAGE_URL_MAP = dict([(i.lower(), i) for i in AMO_LANGUAGES])
 
 TEXT_DOMAIN = 'z-messages'
 
+TOWER_KEYWORDS = {
+    '_lazy': None,
+}
+
 # If you set this to False, Django will make some optimizations so as not
 # to load the internationalization machinery.
 USE_I18N = True