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Some of these errors may be related to the full text search capability in postgres - easily tested by just switching the language to 'en' and re-running the tests.
Postgresql (at least for versions up to 9.1) does not support Japanese full text search out of the box, it requires installation of the postgres module textsearch_ja or use other search engine, such as Solr.
Some other of these errors may be due to the test cases being written for the English setup.