So I tried Sugoi offline translation and I assume this is the breaking that you meant? Yea, no clue why it's doing this. The break is not in the JSON file, and seem to add the space when certain characters come up. Like it will add a space and capitalize when you use the letter o"o" in a word. lol wtf. If I find out why, Ill let you know.
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I think that has to be somthing that Mtool is doing since its latest update. No idea why, you can see in the log it reads the correct version then changes it for some reason. For now I just opened the JSON file in notpad++ and replaced all the lower case "o" with upper case "O". Still looks dumb, but its at least readable.
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Unless its a plugin that teh game is using that is looking for a lowercase "o" to do somthing. Not sure.