It aint just this upgrade
Every damned update that changes the version number also changes my language settings to Japanese. It's a right pain in the arse.
Win10 was installed using English (UK) for language and Japan as location, Microsoft somehow sees that as a valid reason to change my language settings EVERY. DAMNED. TIME.
I'd call them a pack of incompetent clowns but that'd be a slur on pennywise.