Just a quick update. The Spanish translation is now available with the latest version. Thanks to Miriam Ruiz who has undertaken this enormous task.
translation "Drag the slider up or down so that the right sign is in the red square." sould be "Drag the slider up or down so that the right sign match."
Thanks gino, I'll look into that, not sure how to exactly reword it, but to be honest with you, this project really needs a native English speaker to make it sound/read better. I am pretty sure there would be more oddities like this one in other places, but I wasn't sure how to express that better.