I never ever heard about a chaos route, and if you're talking about the promotional image here then I'm pretty sure that's just showing the Dark world route characters, Light world route characters, and your neutral companions that stay with you no matter what. I'm not saying that there isn't a secret route or ending, especially with the weird stuff around White Rabbit, Judgement Luka, and the ending for choosing neither at the Great Decision, but I don't believe that another route has been official announced or endorsed. I do keep up the Azor-X Blog and sometimes the raw site but I'm not 1000% knowledgeable so I might be wrong, let me know if I am!
Also about your translation question, Mtool won't even work. The Part 3 Demo data text is 42 MB long, and the with the maximum tier of Mtool you can translate 50MB. Obviously the full release of Part 3 is going to skyrocket the data text size so Mtool is 100% out of the question.
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