press - pr: add japanese translation of PR's docs.

Log Message:
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add japanese translation of PR's docs.

Added Files:
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pr/releases/8.1/ja:
presskit81.html.ja (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/press/pr/releases/8.1/ja/presskit81.html.ja?rev=1.1&content-type=text/x-cvsweb-markup)
release.txt (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/press/pr/releases/8.1/ja/release.txt?rev=1.1&content-type=text/x-cvsweb-markup)