Language Options
Included are two scripts that that do the following (Windows/Linux):

1. Make [Single Audio] Japanese: Throws out *English audio* and *Signs&Songs subtitles* tracks
2. Make [Single Audio] English: Throws out *Japanese audio* and *Dialogue subtitles* tracks

Put all the video files into the *Language Options* folder and run the corresponding script.
Note for Linux: mkvtoolnix package must be installed

Have a wonderful day! =)