This is a Windows system issue and can be difficult to resolve.
Is the computer set up with multiple languages?
You can try changing the Gimp language but some of the process will be by touch-n-feel
Go to the Gimp menu
Edit and bottom of the menu is
Preferences screenshot:
https://i.imgur.com/9iIphqq.jpg
That brings up a whole list of options and you want Interface which is probably in little squares.
Look for the third down from Tool Options. Click on that then click on the section under
Language
screenshot:
https://i.imgur.com/ZrHGuVQ.jpg
That gets a drop down menu with lots of language options, choose English then guess where ok is (bottom right icon) Ok all and restart Gimp.
If that does not work. Uninstall Gimp from the Windows uninstall menu.
Delete anything C:\Program Files\Gimp (if remaining)
Delete the Gimp profile C:\Users\your-name\AppData\Roaming\GIMP\2.10\ (this is a hidden folder, you need to enable hidden folders)
Install Gimp again using the
Customize option which gives a language choice.
If that does not work try an alternative from
http://www.partha.com