[i18n] Updated Japanese translations

[Hiromi Kimura]

I would like to update Japanese messages:

http://www.tac.tsukuba.ac.jp/~hiromi/horde4-1122-ja.tgz

Thanks.
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Hiromi KIMURA http://www.tac.tsukuba.ac.jp/~hiromi/
PGP Fingerprint16 = 2A 27 2E 46 9E 75 4E 3D  E3 FD 5A DC 2A AA 3A 2E