MicrosoftKBinEnglish.user.js

// ==UserScript==
// @name       Microsoft Support in en-us
// @version    0.6
// @description  forces loading the english version of Microsoft KB Articles
// @updateURL  https://gist.github.com/meilon/fe0742a5ca64d49cc880/raw/MicrosoftKBinEnglish.user.js
// @downloadURL  https://gist.github.com/meilon/fe0742a5ca64d49cc880/raw/MicrosoftKBinEnglish.user.js
// @match      http*://support.microsoft.com/*/kb/*
// @match      http*://support.microsoft.com/*/help/*
// @match      http*://support.microsoft.com/*/topic/*
// @match      http*://technet.microsoft.com/*/library/*
// @match      http*://docs.microsoft.com/*/*
// @match      http*://learn.microsoft.com/*/*
// @copyright  2014+, meilon
// ==/UserScript==

var url = document.location.href;
var re = new RegExp("https?\\:\\/\\/(\\w*).microsoft.com\\/([\\w-]*)\\/(.*)");
var matches = re.exec(url);
console.log(url + " is kb:" + matches[1]);
if (url.indexOf("en-us") <= 0 && matches[1].length > 0 && matches[2].length > 0 && matches[3].length > 0) {
    var newUrl = "https://" + matches[1] + ".microsoft.com/en-us/" + matches[3];
    console.log("Will switch over to: " + newUrl);
    document.location.href = newUrl;
}