The language of the voice commands is set by default when the Huawei smartphone is activated. If you want to change this afterwards, the device does not have to be reset.

Android 10 | EMUI 10.0
Step 1:  Open the  settings
Step 2:  Tap on  Accessibility features
Step 3:  Tap on  Voice control
Step 4:  Tap on  Voice command language
Step 5:  Choose a  language
Step 6:  Confirm with  Change
  1. Open the settings
  2. Tap on Accessibility features
  3. Tap on Voice control
  4. Tap on Voice command language
  5. Choose a language
  6. Confirm with Change

Huawei Instructions