You could also uh, just use something like this to decrypt the image and audio files, place them in their appropriate directories replacing their .rpgmvo/.rpgmvp counterparts, download the RPG Maker MV trial (assuming 30 days is enough for you to translate the game), create a separate project and copy its project file to the base directory of Escaped Chasm's RPG Maker MV project (that is the www directory), open the game with RPG Maker MV and translate it with a nice UI.
If you prefer the JSON approach, though, I would advise at least beautifying the JSON so it's more readable.