You can do it by adding localization resources to an Android extension.
Create one and add via "add source | add SDK", or simply add folders to e.g. GooglePlayServicesExtension.
Under AndroidSource/res/ , add "values-ja/mystrings.xml" with xml body:
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">MyLocalizedName</string>
</resources>
I don't quite remember whether if you have to add default "values/mystrings.xml" as well, but it's somewhat like this.
Reference:
https://developer.android.com/guide/topics/resources/localization