Borderlands 3 - Changing the Language on Epic

Borderlands 3 uses whatever setting your Operating System (OS) Language is for in-game display for Voice and Text.

Here is how you can change it through the Epic Game Store Client

1. From the Epic Game Store Client, at the bottom left, select “Settings”
2. Scroll down to the “Manage Games” option near the bottom of your settings and expand the entry title “Borderlands 3”
3. Check the box under “Additional Command Line Arguments” and then apply whichever supported language you want.