Commit correct Japanese files.

So sorry, now I know what you meant by this:
https://github.com/danielbachhuber/Edit-Flow/pull/140#issuecomment-12582165

I thought you were referring to the lang-locale convention. Doh.
I had correct files locally and was looking at the file names for them - did not notice I put wrong files (from another project) in the branch.

Deleted ja.po/ja.mo and added edit-flow-ja.po/edit-flow-ja.mo.

Again, sorry about not catching what you meant earlier!

--
Also, I have a minor fix for modules/notifications/notifications.php in this branch.