Thanks for the tip, it's working fine.
If anybody else is using this tip than for the OK and Cancel buttons you have to input the okText and cancelText for every filter you want to change the button strings.
This will be a pain with the updates though. Do the updates contain any change logs that state the files that have been changed? I have modified quite a lot files right now and as there's no option to override the files I'll be loosing my changes with the next update.