I have an issue I am unable to fix: I keep getting voice prompts in German, that I think are saying things like "police reported ahead" and "warning: stationary vehicle on the road". I have looked everywhere for a menu setting to change this to English, without success. I don't even know if the voice is coming from the built-in navigation, Traffication or from one of the Android Auto apps. It happens regardless of whether I am actually using Waze or Google Maps, but I have a feeling that these apps could still be active "in the background" even when the Skoda navigation displayed on the screen. The warnings only come occasionally, sometimes days or weeks can go between hearing them.

Where should I look for the setting to turn this off or get it in English?

Sounds like trafficaction. Probably start by turning that off and wait a week or two and see if you have any German men giving you alerts. I doubt it's Android auto or Waze/Google

The only time I have had that type of alert is from Waze; at the time I couldn't find a way to turn it off so the best option was to stop using Waze. I'd like to think that by now (about 5 years on) Waze has a mechanism to turn off the spoken alerts.