Translation updates

[NIIBE Yutaka]

I update Japanese Translation for libgpg-error (git master).  I'm
going to update for gnupg 2.0 and master.  I maintain those.

Situation of Japanese translation of gnupg 1.4 is not good shape.
I don't maintain this.  I don't think it will be updated by the
previous maintainer.  We recommend using gnupg 2.0.

David, I will reply to your messages attaching updated files.
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