"death.attack.sonic_boom.item" displays raw translation string (is untranslated)

The death message "death.attack.sonic_boom.item" is untranslated.

How to reproduce:

1. Use a command to summon a warden holding a renamed item (I know comments are gonna think I'm lying because they didn't do this step).
2. Tower up so the warden can't reach you and place blocks around you so you don't fall.
3. Trigger the warden so it gets angry at you.
4. Let it kill you with its sonic boom.
5. Look at the death message.