I have just sent you a translation into Chilean spanish. Unfortunately today I learned that by updating a plugin you lose translations if they are not part of the plugin itself. In case you do not know I tell you hereby - I gave it a quick shot and did it once again!
A quick note to let you know that for some strange reasons I always have the "Enter" button and the Login button stick together without a padding inbetween. I solve this by giving the button design in your .js an additional padding: p.style.paddingBottom = '25px';.
I do not really know whether this is a general issue that could be made a little more beautiful. But if so it might be a good idea to style it.