date.toLocaleString error: locale not respected

[Muller59]

• Version: v12.18.3
• Platform: Linux VM-Dom 5.4.0-47-generic Nominating Chris Dickinson to the TC #51-Ubuntu SMP Fri Sep 4 19:50:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
• Subsystem:

What steps will reproduce the bug?

program

var http = require('http');
var date = new Date();
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
date = new Date();
res.end('Hello World! Date is: ' + date.toLocaleString("de"));
}).listen(7070);

---

output
Hello World! Date is: 9/10/2020, 12:50:53

expected output
Hello World! Date is: 10.9.2020, 12:50:53 (dd.mm.yyyy with correct separator)

How often does it reproduce? Is there a required condition?

always

What is the expected behavior?

see above

What do you see instead?

Additional information

[bnoordhuis]

v12.x only supports the en-US locale. For other locales, either upgrade to v14.x or install the full-icu package.

Closing, not a bug and a duplicate of several other reports.