Appium- Desired capabilities to Change Language : Only in Simulator and Emulator : No Real Device

It does not supported for Real Devices per official Appium docs

https://stackoverflow.com/questions/49449221/changing-language-via-appium-capabilities-on-android-api-23

https://github.com/appium/appium/blob/master/docs/en/writing-running-appium/caps.md