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2016-12-31 09:42 AM - edited 2016-12-31 10:27 AM
Settings, Languages & input > Languages > Add a language = Suggested > English XA.
What is it? Screenshot added.
2017-01-02 07:27 AM
From what i've been able to find, these two are an Android feature meant for app developers and testing localization in apps. You get them as an option when you enable the developer options in Android by tapping the build number 7 times.