AppLocaleTest.txt

Change the emulator locale from the adb shell
To change the locale in the emulator by using the adb shell, do the following:

Pick the locale you want to test and determine its BCP-47 language tag, such as fr-CA for Canadian French.
Launch an emulator.
From a command-line shell on the host computer, run the following command:
adb shell
or, if you have a device attached, specify that you want the emulator by adding the -e option:
adb -e shell
At the adb shell prompt (#), run this command:
setprop persist.sys.locale [BCP-47 language tag];stop;sleep 5;start
Replace the bracketed sections with the appropriate codes from Step 1.

For instance, to test in Canadian French:
setprop persist.sys.locale fr-CA;stop;sleep 5;start