For translation and other purposes

I use the lib v2.2.25， but there is no audio when browser open the URL, and the video is ok.
It is ok to use v2.2.0， so I research the commit , I found the commit 846257b.
I upcase the opus , It run ok now.
vendor\github.com\pion\webrtc\v2\mediaengine.go:172
Opus = "opus"
to
Opus = "OPUS"

~/.config/youtube-dlg should just contain configuration files and not logs (which should go to $XDG_DATA_HOME/youtube-dlg/ ) nor youtube-dl binary (which should go to $XDG_CACHE_HOME).

Please also consider using appdirs instead of hardcoding ~/.config/

It would be cool if it would remember settings I gave it, so I can have the same settings for multiple files (or even support multi file processing). ATM I need to remember which settings I have set and it is hard to adjust width/height to exactly that dimensions as before.