Summary:

The translation is wrong/missing. 

In the third picture you can see the artifact in-game.

In the first and second picture you can see the german and englisch game.locres.
So you see that on this point there is a wrong/missing translation.

Steps to Reproduce:

Have the artifact "thundering quiver" in your inventory and set the language to German.

Observed Results:

The name is "zusätzlicher Seelenschaden"

Expected Results:

The name is something like " Donnerköcher"