'Save mp3' item in context menu for audio

I'm using Anki for learning english and there is no easy way to extract mp3 file from LDOCE. I've decided to create "Download mp3" context menu item for audio link. 
![screen shot 2014-06-03 at 19 21 31](https://cloud.githubusercontent.com/assets/669244/3162199/e740d202-eb32-11e3-9695-27422bf00acf.png)

P.S. I got no experience with Qt and Python, sorry for possible errors :-)