Fix #49: Add additional Japanese localization strings provided by toshiakikoike

[kden]

This pull request is Finalized

Related issue(s) and/or pull request(s)

#49

Test cases, sample files

My Japanese is rusty, so I validated each new string by looking it up in Google translate and making sure that it was at least a reasonable approximation of the English version (and not, for example, Spam.)

I had to test in Firefox because for some reason the navigator.userLanguage was undefined and navigator.language was en_US in Chrome (Ubuntu 14.04), even though I set my browser preferences to Japanese. In Firefox, I could see and confirm some of the new strings under the Settings->Style menu and they looked fine.

Additional information

[danielweck]

Hello, thank you very much for your contribution. Do you have time to compare with the latest i18n messages in the develop branch? I think there are 2 or 3 new labels to translate. We will review the pending language contributions to merge them as soon as possible. Kind regards, Daniel

[kden]

Is there still interest in having this done, or should I close it out?