Greasy Fork is available in English.
Split the screen but only allow one iframe to be translated.
// ==UserScript==
// @name SplitScreenTranslateHalf
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Split the screen but only allow one iframe to be translated.
// @author daydreamorama
// @match http://*/*
// @include *://archiveofourown.org/*works/*
// @grant none
// ==/UserScript==
// I stole this from a 2011 script that didn't work anymore.
if (window.top == window) {
/* Get current location */
var loc = window.location + "";
/*
* The contents won't be loaded if the location of the iframe is exactly
* the same as the main document (that's probably to protect against
* infinite nesting of iframes), so we need to modify it slightly.
*/
if (loc.match(/\?/))
loc = loc.replace(/\?/, '?%20=&');
else
loc = loc + '?';
document.documentElement.innerHTML = '<head></head>' +
'<body><iframe id="f1" translate=no></iframe><iframe id="f2"></iframe>' +
'<div id="ov"> </div></body>';
var body = document.querySelector('body'), /* Document body */
f1 = document.querySelector('#f1'), /* First iframe */
f2 = document.querySelector('#f2'), /* Second iframe */
ov = document.querySelector('#ov'); /* Overlay */
f1.src = f2.src = loc;
body.style.margin="0"
body.style.padding="0"
body.style.height="100%"
body.style.width="100%"
body.style.background="#bbb"
body.style.overflow="hidden"
f1.style.width="50%"
f1.style.height="100%"
f1.style.border=f2.style.border="none"
f1.style.left="0%"
f1.style.position="absolute"
f2.style.width="50%"
f2.style.height="100%"
f2.style.left="50%"
f2.style.position="absolute"
// f2.style.borderRight="solid 1px #ddd"
ov.style.height="100%"
ov.style.width="100%"
ov.style.position="absolute"
ov.style.zindex="999"
ov.style.display="none"
}