(Add) Button to copy 2fa recovery codes

[PythonCoderAS]

Partially fix #4873

PSA: If you want something to currently output the codes in a form that is easy to copy-paste, run this in the console:

console.log(document.querySelector("pre").innerText.trim().replaceAll(/\s{2,}/g, "\n"))

[Roardom]

What happens when you paste the contents into e.g. a password manager additional field that only accepts a single line as input? Will the codes concatenate into a single long code? Can you ensure this usecase retains at least a single space between each code?

[PythonCoderAS]

What happens when you paste the contents into e.g. a password manager additional field that only accepts a single line as input? Will the codes concatenate into a single long code? Can you ensure this usecase retains at least a single space between each code?

I do not have one of those password managers, but in every single input field that is single-line only, newlines get turned into spaces.

I confirmed this with this following URL in the browser: data:text/html,<input type="text" style="width: 100%">

This gives a single-line text input, and pasting anything with newlines converts them to spaces.