Change Device language via ADB

Question

I want to change language via ADB. I try:

adb shell setprop persist.sys.language fr;setprop persist.sys.country CA;stop;sleep 5;start

but I

Answer 1

For Android M or newer, you need use:

setprop ro.product.locale xx-XX
setprop persist.sys.locale xx-XX

xx is language, XX is country