PeskyMsdn.js

// ==UserScript==
// @name         Pesky MSDN translations !
// @namespace    http://madidier.github.com/
// @version      0.2
// @description  Disable translations on MSDN and other MS documentation sites.
// @author       Maxime A. Didier
// @match        https://*.microsoft.com/fr-fr/*
// @grant        none
// ==/UserScript==

(() => {
  const newLoc = document.location.href.replace(/https:\/\/(msdn|docs).microsoft.com\/fr-fr\//, "https://$1.microsoft.com/en-US/");
  if (document.location.href !== newLoc)
    document.location = newLoc;
})();