Added formatting for remaining timeout duration

[M4tthewDE]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

Converts remaining timeout into more human readable form.
Not sure if this warrants a changelog entry. First pull request, feedback apreciated.

[zneix]

I'd add a minor changelog entry in here, something along these lines: - Minor: Added human-readable formatting to remaining timeout duration. (#2398)

[pajlada]

Thanks a lot for your contribution!
If you want to, you can make another PR adding yourself to the contributors.txt list to make your name show up in the Chatterino about page!
See https://github.com/Chatterino/chatterino2/blob/master/resources/contributors.txt#L1-L2

[pajlada]

Waiting for #2426 to be merged in, then I'll get your branch up-to-date to master and then merge your branch into master