def labels_for_zone(zone):
    '''
    Extract all known zone labels
    - main code
    - keys (postal...)
    - name translation in every supported languages
    '''
    labels = set([zone.name, zone.code] + zone.keys_values)
    for lang in current_app.config['LANGUAGES'].keys():
        with language(lang):
            labels.add(_(zone.name))
    return list(labels)
Extract all known zone labels
    - main code
    - keys (postal...)
    - name translation in every supported languages