Backup your data folder’s local_en.pack (or local_fr.pack , etc.) before installing any major overhaul.
If the Steam settings do not apply or you are facing "mixed language" issues (e.g., UI in English but voices in Spanish), you can force settings manually: Edit AWE.ini empire total war language settings better
Let’s get this out of the way first.
While enhancing language settings can have several benefits, there are also challenges and limitations to consider: Backup your data folder’s local_en
Empire Total War stuck in a different language. : r/totalwar empire total war language settings better