Ensure your directory has the core Call of Duty: WWII game updated to the version immediately preceding the Shadow War DLC. Applying a final update to an outdated base build will corrupt the file structure.
Open the steam_emu.ini file located in the bin or main folder and change the language line to your preferred language (e.g., Language=french ). Troubleshooting Common Issues call of duty wwii shadow war language packcodex updated