messages in all tests can be written in English without any settings.
Merge pull request #368 from takahashim/all-test-in-en

messages in tests should be written in English without any settings
add messages from epubcheck-3.0-ja

cf. http://info.jepa.or.jp/document/epubcheckj (in Japanese)
[WIP] translating... (ja)
translate some of CSS_XXX messages
translate OPF
transle CSS messages
CHK_??? and RSC_??? are done.
translate PKG messages
translate HTM
remove trailing spaces