I specialized in sound design at university, I can clean this file up for you with professional quality. This includes clearing background static noise and adjusting sound levels so that your audio can be heard clearly and easily.
I can deliver this in less than one day, and if you need to see an example of my sound work please view my profile where you'll see a radio play I produced that was broadcast on the BBC.
(Please note that the above does not include subtitling, but I think it won't be needed)