The Arabic pack does not include voice acting. Geralt and NPCs will speak their default language (English/Polish/Russian depending on your disc region). The audio language is separate. To fix weird audio mixing:
To install the Arabic language pack for The Witcher 3: Wild Hunt
A: Possibly. Some EU discs (Region 2) are compatible with the Middle East store, but not all. If you cannot find the pack in the store using your main account, use the “Create a ME account” trick mentioned in Error 1.
A: Go to Options > Display > HUD Size and set it to “Large.” Also, on PS4, you can enable System > Accessibility > Zoom for reading lengthy quest logs.