[i18n] updated Japanese translations

[Hiromi Kimura]

I updated Japanese translations for horde-webmail-1.2.5.

http://www.tac.tsukuba.ac.jp/~hiromi/webmail-125-ja.tgz

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Hiromi Kimura, Tandem Accelerator Complex, University of Tsukuba, JAPAN
PGP Fingerprint16 = 2A 27 2E 46 9E 75 4E 3D  E3 FD 5A DC 2A AA 3A 2E