Userscript for Greasemonkey and Chrome to highlight and console.log Rails I18n missing translations

missing_translations.user.js

// ==UserScript==
// @name         Highlight Rails I18n Missing Translations
// @namespace    http://mikenaberezny.com
// @description  Highlight and console.log missing translations from Rails I18n.
// @include      *
// ==/UserScript==

// Rails I18n wraps missing translations in <span class="translation_missing">
var elements = document.getElementsByClassName("translation_missing");

// style that will be applied to those spans
var highlight = "background-color: #ffff00; color: #000000;"

for (var i = 0; i < elements.length; i++) {
  var el = elements[i];
  if (el.nodeName != "SPAN") { continue; }

  el.style.cssText = highlight;
  console.log("Translation Missing: " + el.innerHTML);
}