Greasy Fork is available in English.
This theme was for the Chrome extension "Controls for YouTube", but now it's included in the extension itself.
/* ==UserStyle==@name Controls for YouTube - Alternative Theme (OBSOLETE)@description This theme was for the Chrome extension "Controls for YouTube", but now it's included in the extension itself.@namespace lednerg@version 20.9.7@author lednerg@license CC0-1.0==/UserStyle== */@-moz-document domain("youtube.com") {.yts-centered.yts-seek-duration {background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAyCAYAAAAeP4ixAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAPVJREFUeNrsmMsNwjAQRBNECSkmTVBHuHKmklAKDUAx4eizWUtEQpH4eMCxdz0rjXIaKU8aJ+NtvfeNhdk0RoYgBCEIQQhCEIIQRDmIE42iLrEHm9B+v9Q8F1Gf0AMJAQkziYZEnlVB5hlF3Z89WUA+xQbxZAN5FxvEkxXkVWwQTxEgy9ggnmJAnmODeCCQNmKLsta65SQ6iqYYU4kgYa6iw+Opumv1orNoX11p3Bb6XiaiFQ77LgYiJcgtJt8LzxD7xUJrfBU/RPUVxURpNFHj1V+sTFx11S8fHBALlypKv9R4bhoJQhCCEIQgBCEIQSoFuQswAPERVNhVvu63AAAAAElFTkSuQmCC') !important;transition-duration: 0s;}.yts-control-wrapper {margin: 0 7px;}button.ytp-button.yts-replay-button.yts-replay-button-medium.yts-replay-button-rewind.yts-block {transform: translate( -15%, 0% )!important;}.ytp-fullscreen button.ytp-button.yts-replay-button.yts-replay-button-medium.yts-replay-button-rewind.yts-block {transform: translate( 0%, 0% )!important;}.yts-control-wrapper .yts-replay-button {font-size: 0%;transform: translate( 0%, 0% )!important;transition: transform 1.5s ease-out;transition-delay: 1s;}.yts-replay-button {zoom: 0.8;padding: 1px 4px 0 6px!important;transition: padding-top .5s ease-in-out !important;transition-delay: .25s !important;}.yts-replay-button:hover {padding-top: 5px !important;transition: padding-top .125s ease-in-out !important;transition-delay: 0s !important;}.yts-replay-button-short {padding: 1px 8px !important;margin: 0 0px;}.yts-replay-button small {text-shadow: 0 0 1px black, 0 0 2px black, 0 0 3px black;position: relative;padding-top: 0px !important;top: -15px;font-size: 11pt;opacity: 0;transition: opacity .35s ease-out;transition-delay: .25s;}.yts-replay-button:hover small {opacity: 1 !important;transition: opacity .125s linear !important; /**/transition-delay: 0s !important;}.ytp-fullscreen .yts-replay-button {width: auto !important;}.ytp-fullscreen .yts-replay-button-short {margin: 0 0px !important;}.ytp-fullscreen .yts-replay-button {zoom: 1.2;position: relative !important;bottom: 2px !important;}.ytp-fullscreen .yts-control-wrapper {margin: 0px 7px;}.ytp-fullscreen .yts-seek-duration small{zoom: 1 !important;}}