[Translators] Japanese translation was updated

[Fumio Nakayama]

Hi Christophe,

I updated Japanese translation.
"POT-Creation-Date: 2012-03-16 18:33+0000\n"
"PO-Revision-Date: 2012-05-05 00:02+0900\n"

$ LANG=C msgfmt --statistics -v -o vlc.mo ja.po
5855 translated messages.

Here is the latest po file.
http://www.n6a.net/vlc/2.0.1/ja.po

regards,
Fumio Nakayama