Font Size
The description font size seems to have shrunk a bit and, while still readable, looks bad.

This also affects quest segment/tab descriptions as well
I did shrink it a little (by two pixles) I'm unsure what exactly you mean by "bad" from that image. Do you mean something like aliasing at a particular resolution?
The width of the letters is off. If you look at them closely the left and bottom are "fat" and the right/top are skinny. Compare this to Ultimate Stew where the letters are uniform all the way around. If you zoom way in on the image it becomes more apparent. Lowercase n, o, and b show it prominently.
Hmm... that could be difficult to fix depending on how Minecraft and OpenGL are doing texture scaling. I'll see what I can do anyway
I've reverted the font size changed in build 3.5.296 for now until I have a more permanent solution to this. I'll leave this issue open as a reminder
For small quests, it doesn't make sense to shrink the text. You could make it change to a smaller automatically if the text is long, or you could add a button to toggle between small and normal. But the best for consistency, imo, is to just leave it as-is, and respect the user's UI scale setting.