The solution is to
go to 'lock screen settings ' open the app, select another picture, reboot , go back to 'lock screen settings ' and select 'windows spotlight again' and it comes back into the language that you originally had
regards
Julie
Thanks Julie Neville - that worked for me.
I tried this but didn't work for me. I am also finding the picture on the lock screen is also not changing together with the foreign characters still there.