Here are some answers:

1. Can you explain the function "AI Creatures+: Tier1-4"?

AI is not playing very well against creature mobs, so each week the game gives the AI bonus creatures to compensate for losses. This shows the tiers of creatures it receives. The higher the difficulty, the higher the tier of creatures it may get.

2. Shouldn't it be ore, not wood?

You should be correct, but I am not sure if this file is not used for another thing than town specialization. Better leave it as it is.

3. Shouldn't "Threat level" be written there?

Leave it as it is. I was told that the text is based on the in-game situation, so it is probably ok. Otherwise, it is not a big deal.

4. Typo? "...lie beneath the still water", this is a building on land, what does water have to do with it?

This building is found only in water in this mod.

5. It's unclear, the name is one thing, but the text inside is another: "Champion Charge" or "Acid breath"?

Original "Champion charge" was not working. Magnomagus did some fixes. I guess this is what he uses as in-game text for it. Leave it as it is.

6. Two Magic Guilds in the Preserve town?

This is Nival's fault. Some of the stuff inside is a huge mess. Translate both. Not sure which one is used.