Update ja.xml

Fix a number of typos.
Make it more consistent. (「する」or「します」/「の」or「を」)
"Found" should be "Search results" instead of just "Results".

This pull-request is just a minimum fix.
Naofum-san's translation looks too word-to-word.
I believe my translation which I sent you (via e-mail) is better in quality/usability.
I'd suggest you take mine as a whole. (except the recent mail-address change)