I spent days looking and searching for a database with actual plain language descriptions for the media types, for example
finfo(.png) --> "image/png" --> "PNG image".
In Ubuntu based OS's you can find already translated database at /usr/share/mime
http://manpages.ubuntu.com/manpages/hardy/en/man5/gnome-mime.5.html