I've added that code in to - code/core/Mage/Core/Model/Translate/Inline.php (I understand the 'never edit core' rule. This is purely for testing purposes for now.

But I'm now getting "Uncaught TypeError: Cannot read property 'observe' of null " from Chrome dev tools upon page load.

I did add a fix in to the same place you've asked me to modify a few days ago so the translation popup appears in Chrome, so I'm unsure if this affects the code that you have supplied. This is the other code I added:


if(Object.defineGetter)
        {
                var hasTranslateAttribute = function(){
                        return $(this).hasAttribute("translate");
                };
                document.observe("dom:loaded", function() {
                        $$('*').each(function(theElement){
                                theElement.defineGetter("translate", hasTranslateAttribute);
                        });
                });
        }