Every user displayed message/text should be a string resource object

[ReCodee]

Summary:

We should make a string resource object for every user displayed message/text, so that if in the future we plan to add multi-language functionality, then we can easily provide a multi-language alternative.

For eg:- we have many variables declared inside Constants.java which contain user displayed message/text and could be a hindrance in the future while adding multi-language functionality.