What browser are you using? What do you do to stay private?

Probably you have cookies set ragarding your language preferences for the sites you browse on a regular basis, at least.

If you are data roaming with your home phone plan, then it is normal. The local carrier tunnels the traffic back to your service provider in your home country and then it routes to the internet from there.

I get it all the time when I'm OS travelling.

You'd need a VPN in the country you're in to make the traffic appear local..

If it's happening on WiFi, it will be your language setting. If you're on android, try setting up a different user profile with different language and locations settings as a quick test.

Android or IPhone? My guess would be the OS of the phone was set up with your home country, you may be able to switch it manually?

This might be imposible to override

Might be just your OS language? It's pretty easy to detect with JS and many websites rely on it to supply the most relevant page.

I noticed similar things but never on wifi. I have used an Austrian sim card in other EU countries, and whenever I connect to a VPN server with the "Fastest" profile, it will connect me to an Austrian server every time.

I guess it makes sense but I still don't fully understand why local servers aren't considered faster. Anyway I never had an issue with wifi. Maybe you aren't actually connected to the wifi somehow?

El tuyo telefono es espãnol porque habla con la sim. Es claro tu quieres cambiar operator de tu idioma por haces el idioma que te gusta. (Thanks duolingo).