Greasy Fork is available in English.
Uses all space available for the subcription box
// ==UserScript==
// @name SubBox+
// @namespace http://ekoze.ca/
// @version 1.0
// @description Uses all space available for the subcription box
// @author Chad Gregory
// @match https://www.youtube.com/feed/subscriptions*
// @copyright 2016+, ekoze.ca
// @require http://code.jquery.com/jquery-latest.js
// ==/UserScript==
(function() {
'use strict';
$('#content').css('width', '100%');
$('body').css('background', 'transparent');
})();