I think installing the Japanese version of the RPG Maker XP RTP should solve the problem with dialog now showing.
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But by far the easiest solution for you guys I think is to do as
@shuckle said and just open "Game.ini" and change "Library=RGSS104J.dll" to "Library=RGSS102E.dll". I just hope you don't run into some other problems because of that.
Oh man, you have to try Sangeki of Gear. This one is weakest of trio in my opinion. But I played it long ago and with auto-translator, so in-game translation should raise score a notch.
There are actually 4 games made by Scale Garden, not three.
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Breath of Fire and Iron is the circles 2nd game. I plan to translate the first one as well so every single one of them is translated. And Scale Garden isn't dead, he's still working on his new game but it's taking him so damn long.