Greasy Fork is available in English.
This script helps watching playlists. It tracks the last video from a playlist that you've watched on this computer.
< Feedback on YouTube: playlists playback tracker
Thank you! I've added a link to YouTube Resumer to the description.
Very helpful. Works well with YouTube Resumer.
https://greasyfork.org/en/scripts/455475-youtube-resumer/feedback