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Not sure if I would call katfile a reasonable source but thx.
Bad news.
The game's dialogue is stuffed in .sl files so a normal MTL isn't going to work.
Not even a MTL of the menus will work because most of them are picture based.
I have a sl decoder but you can't feed the resulting txt to Translator++, so the only option is manually translating because feeding them directly to google would completely break the formatting.
This is everything translated that is still grabbed by Translator++. To use it you would have to unpack the game first with all decrypter. Also added the sl decoder if someone wants to try to manually translate this. (These tools are not made by me.)