The stg files in the main Stage folder does contain the dungeon scripts but doesn't indicate who said that line. Last time I checked, this file holds the order of the scripts inside the dungeon.
Here's a comparison. The one on the left is the extracted file from this week's patch. The one on the right is the extracted file two months ago.
From this, I think the developers changed their way of compressing their files. If you guys have any updated extractor kindly send me a link :P
The real reason why I needed this was because I can't run Karuel Border and read the scripts myself.(I'm still weak and people wants me to press x)