2 error messages

[DrByte]

v1.3.0.2-l10n-jp-2 [2007-09-05 21:57:23] (v1.3.0.2-l10n-jp-2)
v1.3.0.2-l10n-jp-1 [2007-09-05 21:54:49] (v1.3.0.2-l10n-jp-1)
v1.2.3 [2005-05-02 19:37:46] (Version Update 1.2.2->1.2.3)
v1.2.3 [2005-01-15 22:40:52] (Fresh Installation)

You don't show any upgrade steps related to 1.2.3 to 1.2.4,
or 1.2.4 to 1.2.4.1
or 1.2.4.1 to 1.2.5
or 1.2.5 to 1.2.6
or 1.2.6 to 1.2.7
or 1.2.7 to 1.3.0
or 1.3.0 to 1.3.0.1
or 1.3.0.1 to 1.3.0.2

Those are important upgrade components. Perhaps the folks maintaining the Japanese code may be able to help you apply the appropriate upgrades to your site.