URL conversion from %?? to UTF-8

[Osamu Aoki <osamu@debian.org>]

Hi,

I am looking for a method to convert URL with non-ascii character 

from

  http://fr.wikipedia.org/wiki/Param%C3%A8tres_r%C3%A9gionaux

to

  http://fr.wikipedia.org/wiki/Paramètres_régionaux

with some short script or command.  What is the easiest way?

Osamu