Bug 1051793 - [CMAS] Plug in real CMAS input to the CMAS application

- Add cellbroadcast system message handler
- Removed unused styling and testing UI
- Add localization properties
About the loading mocks: Because the test cases in simple for each modules and only 1 or 2 methods needed for mock, that's why I didn't use any mock in index_test(and it can even saving the mock helper loading :p) But since it's simply unit test and there is no need to saving resource on it, I'm ok if you think it's more unified to all the tests .