Describe the bug
A librarian had a trade of selling a disabled book called "weapons" when I progressed in trading with him.

To Reproduce
Keep trading until there is a chance for disabled book to show up?

Expected behavior
No trade for disabled books

Screenshots
http://prntscr.com/rv6byf

Info:

• Modpack Version: 2.77 pre-release
• Server or Singleplayer: singleplayer
• Version the world was created on: 1.12.2 MC, v2.77 pre-release (modpack)

Additional context
Why u sell me disabled enchantment book villager? >:(

Not much we can do about this until 2.79.

reopen if this is still an issue in 3.0

Was this fixed when we finally disabled the unused enchantments?