I did a getprop on my system today.
I have following
[ro.product.locale]: [en-US]
[ro.product.locale.country]: [US]
[ro.product.locale.language]: [en]
[ro.product.locale.region]: [US]
Which has always been the default in FYT builds for outside China..
The values for
persist.sys.language
persist.sys.country
are empty.
But I do have [persist.sys.locale]: [nl]