Changing `iteritems` to `items` works: - https://github.com/arteria/cmsplugin-contact-plus/blob/58dbc76d6cf2b4cc499e4ca5d4b11d762d7c0a19/cmsplugin_contact_plus/actions.py#L77 - https://github.com/arteria/cmsplugin-contact-plus/blob/58dbc76d6cf2b4cc499e4ca5d4b11d762d7c0a19/cmsplugin_contact_plus/actions.py#L92
