i18n: add Japanese translation

[FUJIWARA Katsunori]

At Sat, 14 Feb 2009 01:16:13 +0100,
Martin Geisler wrote:

> I changed this translation so the '%' became a '%s'. Otherwise a runtime
> error would occur:
> 
> > +msgid "%s: binary file\n"
> > +msgstr "%: バイナリファイルです\n"

Sorry and thank you for adjusting.

> To catch such typos in the future, please make sure to include the
> special "#, python-format" comments. They are generated by the xgettext
> program. This means that they will be included the next time you run
> 
>   make update-pot
>   msgmerge --no-location -U i18n/ja.po i18n/hg.pot
> 
> I have done this for the translation.

I'll do above in my translation posting process.

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[FUJIWARA Katsunori]      fujiwara at ascade.co.jp(foozy at lares.dti.ne.jp)