add more country at "systemlanguage"

Hi, I have a favor to ask about "systemlanguage"

I'm developing a app with my team, and we are planning to distribute and support the app for more than 70 countries. By using "systemlanguage", we want to display corresponding language with Android device system language.

However we realized that "systemlanguage" supports only 40 countries, so we can't recognize another 30 countries.

Questions

1. Are there another ways to recognize another 30 countries language by using "systemlanguage"?

2. Could you suggest ways that we can support languages that are not in systemlanguage without using "systemlanguage"?

3. Could it be possible that Unity team add our language list at systemlanguage? (I know I ask too much. Since it is quite important issue for us, I try.)

We really want to support all languages as possible as we can. This is a our special goal: global supporting. We expect to support various language including "Uzbek" and "Kazakh" etc..