code: function parseLanguage (node, nodeType, feedType) {
    return utils.get(node.language) || utils.getAttr(node, 'xml:lang') || utils.get(node['dc:language']);
  }
docs: Parses the language for meta nodes
  
  - language
  - highest priority for RSS feeds
  - commonly found in RSS feeds and rarely in ATOM feeds if ever
  - xml:lang
  - highest priority for ATOM feeds
  - more commonly found in ATOM feeds and rarely found in RSS feeds if ever
  - dc:language
  - next highest priority for RSS feeds
  - more commonly found in RSS feeds and rarely found in ATOM feeds if ever
  
  @param node
  @param nodeType
  @param feedType
  @returns {*}