Hello, I'm a dull Japanese
All translated into English using Google Translate
I used 7zip to edit the en_us.lang file of the jar file source to create ja_jp.lang.
I think that ja_jp.lang should be implemented so that the Japanese version of Better Fps can be used comfortably in Japan.
Some of my incomprehensible sentences, which I am not good at English, are still in English, but most of them are in Japanese.

Of course, the installer is also in Japanese.
The directory where the files are placed
/ assets / betterfps / lang is.

https://www.mediafire.com/file/8vxuv7yieqlsgvc/ja_jp.lang/file