add Japanese Translation
Revert "add Japanese Translation"

This reverts commit 236086f4ef4630ff2144ccfdbde7c9ecd1858591.
Revert "Revert "add Japanese Translation""

This reverts commit f3a1fef5cb7d60c009235079ad9ba522b1528b6c.
Merge pull request #10 from sim00/master

add Japanese translation