Audio language pack doesn't work on NPCs. Solution: Check your Windows sound settings. The Packrune requires "Spatial Sound" to be turned off , or the directional audio overlay fails.
If you have the RUNE version and find that the voices remain in English after changing the text, you may be missing the necessary vocal data files. starfield language packrune full
If you are looking at this specific file or term, here is what it generally entails: Audio language pack doesn't work on NPCs