transliteration

[softlines]

Checklist

• I'm reporting a feature request
• I've verified that I'm running youtube-dl version 2020.09.20
• I've searched the bugtracker for similar feature requests including closed ones

Description

Currently Сyrillic (and probably other alphabets') characters are stripped when the --restrict-filenames option is used, so you end up with something like _.mkv as your filename, if your output template is set to %(title)s.%(ext)s.

Example:
https://www.youtube.com/watch?v=aDsWuOF-RBQ

Output filename should be:
Vitas_-_The_7th_Element_Sedmoy_element_Nastoyashchiy_noviy_god_2_0.mkv

Possible template for transliteration: https://pastebin.com/53jyS883