code: function getLanguages(properties) {
    if (!Array.isArray(properties['wof:lang_x_official'])) {
      return [];
    }
    return properties['wof:lang_x_official']
      .filter(l => (typeof l === 'string' && l.length === 3))
      .map(l => l.toLowerCase());
  }
docs: get an array of language codes spoken at this location