To change your game to Japanese make sure to execute the following steps:

1. Replace the localization.txt and localization_mp.txt in your Black ops 2 Folder 

2. Drag the japanese folder into the zone folder. (DO NOT CHANGE ANYTHING)

3. Open "sound", search for the word english and then rename everything that says english into japanese.

spl_angola_2.english.sabs would be spl_angola_2.japanese.sabs

If you wish to have the English BO2 back, make sure to have backed up all your files and verify game cache.

