As a developer who adds new keys to main ARB file,
when I want to translate them to other locales,
I want to be able to automatically add missing keys to non-main ARB files
so I can know what keys needs to be translated without manually comparing main ARB file to non-main ARB files.
As a developer who adds new keys to main ARB file, when I want to translate them to other locales, I want to be able to automatically add missing keys to non-main ARB files so I can know what keys needs to be translated without manually comparing main ARB file to non-main ARB files.