JMST is post-BB GMS

That was expected. Monster maps hardly changed after Big Bang mostly just the spawns were made better and more concentrated. Read what aslemn said. JMS has only a few things more than us one being Neo Tokyo which we're probably getting later this month. It's own form of China. Also possible for us to get, it's in our data. Thailand floating Market which I never saw any value in besides questing and exploration. The Taiwan maps which due to what NEXON said a couple months ago its probable we'll get that in our own form. If just Night Market then fine. Plus GMS has Haunted House our own version of CWK, NLC the complete MSEA world tour. So we're pretty even content wise if not better. If we get Neo Tokyo then all bets are off.

Exactly. GMS has the most content so translation KMS into GMS first, then into other languages like Chinese, Japanese and French makes more sense than finding Korean-Chinese, Korean-Japanese and Korean-French translators (who would charge more than English translators)

I still don't get the point of this. You first said JMS is post BB GMS, then you say that BB was originally in japanese and since JMS has things GMS doesn't, then it's not post BB GMS.
I might not be understanding properly, but i can't see the point of this.
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Big Bang was originally written in Korean, translated into English, and supposed to be retranslated into Japanese. Since Japanese, in this case, is way more based onto english due to foreign names.
Big Bang isn't a Japanese creation, it's a korean. Unless you're misunderstanding SwordStaker, you need to check KMS from some months ago.
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All translations from MS need to be like that. It's a bug actually, they forgot to retranslate that. It's way easier to go Korean > English > Japanese than Korean > Japanese.
Since the structures are way different...
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Also, larmie. There are LOTS of korean letters around JMST. But can you see them? No, unless you're in Korean codepage.
Know all the ????? NPC's? It's the result of Korean letters being shown in JP codepage. There are pomegranateloads of korean texts forgotten, the fact is that you can't see them in game. Unless you're in KR codepage, which is impossible since JMS NEEDS to be in JP codepage.
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Still, i don't get what you're saying.

BB refers to Core Blaze in JMS I thought he was referring to Neo Tokyo. Korean letters could be leftovers from Korean --> English translation. The English names are a separate issue; Koreans applied English names to their version which was mistransliterated into English. That was ported to JMS and other versions, resulting in "Kerning City" (instead of "Cunning City"); the mistransliteration could be seen in the Ellinia Ship Dock; the Greek letters for Kerning is completely messed up.