I feel like I'm chasing my tail on this one, but I need to be able to test in languages not listed under Settings > Language & Input > Language. I've spoken with Samsung & Motorola and they tell me that it is impossible. I'm not willing to accept that answer as I know there has to be a way to test language support for the mobile apps I test. This is where Android gets stingy and makes Apple look like the savior of all things.
That particular phone doesn't support that languages you want? Hacking your code or hacking you device undermine your attempts to simulate a realistic situation. Perhaps you can install a vanilla android OS on the phone that does have these languages.
Otherwise, buy another phone or use an emulator, either for free on your pc, or maybe even use an emulation service like browserstack. If it can't be done on the free emulator, yet there isnt budget for the other two options, the test probably isn't worth doing.
@Brenda - Its really not convincing saying I'm not willing to accept answer from Samsung & Moto.
- Could we use any hardware with our computer, without using its drivers? [software required to interact with hardware]
Everyone knows answer, Right!
Its similar to your scenario, when device is not supporting any particular language that simply means that the device is not having instructions about "How to deal with it & How to display the text" in particular language.
We can not by pass this! We can test app with only those languages which your device supports.