Greasy Fork is available in English.
This script injects a search field into the dialog where user can save a video to a playlist. When the user starts to type an incremental search is implemented and the playlists are filtered out
< Commentaires sur Youtube Save to... playlist incremental search
So much needed
This is something I've been looking for a long time. I cannot understand why this is not part of the standard YouTube GUI.
Just installed and seems to work great.