replace _ by - in slot names

newsbox_cms/models.py

@@ -18,7 +18,7 @@ def newsboxcms_mcls_processor(mcls, class_name, class_bases, class_attrs, base,
     newsbox_opts['trans_fieldnames'].append('newsbox_summary')
 
     class_attrs['newsbox_body'] = PlaceholderField(
-        'newsbox_body',
+        'newsbox-body',
         verbose_name=_('body'))
     if 'newsbox_body' in newsbox_opts['trans_fieldnames']:
         newsbox_opts['trans_fieldnames'].remove('newsbox_body')