add Japanese translation

I think original text have two problems.
(1) In output, return value must be list of list of list of tuple.
(2) In example, there is no return value. I guess correct value is [[1,
1]].
add Japanese translation revised

I have misunderstanding.
The return value should be a list or a tuple of two integers.
Merge pull request #1 from sim00/master

add Japanese translation