Missing translation string "enchantment.level.<value>"

The bug

The enchantment.level.<value>  is untranslated.

How to reproduce

1. Give an item for self with enchantment level higher than 10:

   /give @s stick{Enchantments:[{id:knockback,lvl:11}]} 

→ It displays untranslated string enchantment.level.11, instead of normal text.