Update ja_JP.xml

-Getting this thing up-to-date with the new 1.5 localization standards.
-Translations for aludel and alchemical chest.
-Changed version.current and version.outdated to better match English. (Very, very crude; be warned.)
-Most commands and message stuff are missing; will find a Japanese friend of mine (or Minalien) to translate later.
Merge pull request #272 from anonymouspineapple/patch-1

Update ja_JP.xml