These kinds of things are cute and fun—but does anyone use these sorts of language x to language y translators in practice? Not talking about specialized language interpretation. With JavaScript, the most common operation is to manipulate and capture from the DOM—something that this tool is not capable of readily doing, not, at least, without getting one's hands dirty with JS.
The challenge is to do that is that there is no "Pythonic" way of manipulating the DOM. When we were building a similar translator we included a way to interact with JQuery through a js object (i.e. js.document.addEventListener) -- but it still required the user to think about and understand javascript.