Aquanauta,
The player above did more than just swap their language - they also needed to redownload the game client. You might try that as well. Keep in mind that we have no control over distribution of the game clients on PS4 - that’s all on Playstation’s end. I did some digging online and it looks like when folks purchase the game they receive multiple copies of the game to their games library as well. Check your library and see if you can download the English client instead if you’d prefer the English version. Beyond that, you’ll want to reach out to Playstation support to figure out how to install the correct copy of the game (assuming one exists in the language you wanted to use.)