That's just a script in the template folder, and we didn't put it there, it's not part of the default installation. Either way, a single javascript file does not provide backend controls for a template, plugin or anything else. More is required to provide that functionality and all of those files are found in plugin folders, admin folder ECT.
I can't say how that script got there, either you or someone else placed it there, it's not part of our default template. See screen shot of the default script folder.
The difficult we do immediately, the impossible takes a little longer.