You can make one big locale mod, where you can have a lot of files in "mod/locale/ja/". It's not limited at all.

I know I can put it in one mod.
But I think some people do not want to be loaded into memory even though they are locals of mod that I do not use.
Even if it's not a big deal.
That's why I am making an individual mod.

Don't worry, the mod with locale for all mods will be less than 1-2 MB, one sprite sheet picture in the game is often much bigger.

all right.
I think that it will be redone when updating to 0.17, so at that time I will also rebuild locale mod.