I'm all for clever localization but please don't just leave out important story.

[File2ish]

...the fact that the Japanese translation is superior and contains so much more information.

I don't think the Japanese version is superior to the English version by any stretch (that said, I can only go off of the JP unofficial translation, I don't know how it actually is in Japanese). If anything it reveals too much information in my opinion.

And if you think amount of information is the deciding factor, the amount of information presented in the Japanese version's dialogue is not indicative of it being superior to the English version we received. There's more to writing a story than presenting information to the audience, it's how the writer (or in this case, translator) wants to present it and how it is actually written.

The information is there within the story, just not explicitly stated in the immediate conversation with Midgardsormr. Why? It didn't need to be. All of what is outright stated in the JP version can be inferred in the EN version. Some may think the JP version is better, I'm not trying to argue if it is or isn't. However, it doesn't have the traits of good writing in my opinion (solely judging by the direct translation, as I can't read Japanese).