What steps will reproduce the problem?
(1) Start demo mode setup from OOBE
(2) Choose language and press OK
(3) On network screen you will see that 'Offline demo mode' is in correct language
(4) Go back
(5) Set different language and press OK

What is the expected result?
'Offline demo mode' should change language

What happens instead?
The language is never updated after it was initially set