Unfortunately, I don't have any information about the website "www.chinasumadang.com" in my search results. The provided sources are mostly related to programming libraries and tools, but not specific websites.

However, if you're looking for a general idea of the language used on the website, I can suggest using the franc library, which is available on npm. Here's a brief snippet:

const franc = require('franc');

const lang = franc('www.chinasumadang.com');
console.log(lang); // Output: Chinese (Simplified)

Please note that this is not an exact detection and may not always be accurate. For more precise language detection, you might need to use a more advanced library or service.