Greasy Fork is available in English.
Translate Web Page.
// ==UserScript==
// @name Translate Web Page
// @description Translate Web Page.
// @version 0.1
// @author to
// @namespace https://github.com/to
// @license MIT
// @match *://*/*
//
// @grant GM_registerMenuCommand
// @grant GM_openInTab
//
// @icon https://www.google.com/s2/favicons?sz=64&domain=google.com
// ==/UserScript==
const TO_LANG = 'ja';
const FROM_LANG = 'auto';
GM_registerMenuCommand('by Google', () => {
GM_openInTab(
location.href.replace(
location.host,
location.host.replaceAll('.', '-') + '.translate.goog') +
`?_x_tr_sl=${FROM_LANG}&_x_tr_tl=${TO_LANG}&_x_tr_hl=${TO_LANG}`);
});