Support of Punycode

[linnowo]

Describe the feature or enhancement

Hope to display the Punycode domain in the Reffers section as the source language. Or display the source language first, and then add a conversion button to convert it to Punycode.

[mikecao]

We can probably use this package for conversion, https://www.npmjs.com/package/punycode

[twiesing]

Stumbled across this because I noticed that there is no automatic punycode conversion, so I can't save umlaut domains in the frontend.