This mod adds a JEI info entry for every enchantment that has a lang file description entry. Press R while hovering over a book with a single enchantment to view info about it.

The enchantment description lang entry format is that same as its name format plus the suffix ".desc" or ".description":

Lang Entry Format: "enchantment.[MOD_ID].[ENCHENTMENT_REGISTRY_NAME].[SUFFIX]": "[DESCRIPTION]"

Example: "enchantment.jeienchantmentinfo.fire_protection.desc": "Reduces fire damage and burn time."

Example Lang File: 'Discernment' mod's lang file