entity.ShulkerBullet.name appears when killed by a ShulkerBullet that wasn't spawned from a Shulker.

When you get killed by a ShulkerBullet that wasn't naturally spawned from a Shulker; the game outputs: "Logical_cyclops was slain by entity.ShulkerBullet.name."

obviously it doesn't output my username for everybody except for me of course, but it's a example of what the bug is doing.

How to reproduce:
1. Load 15w41b on any of your worlds.
2. use the following command multiple times
until you die:

/summon ShulkerBullet ~ ~5 ~

and you should get a message saying that you were killed by entity.ShulkerBullet.name.

Which I expected for it to say: (Username) was slain by ShulkerBullet.

Video demonstration: https://youtu.be/-xJV1EbdrLk