Map errors to code

[vrongmeal]

We can map multiple errors to their unique codes which will be useful to create the frontend since the error string returned is not refined. Marking this as question since we might need to discuss this whether to refine the response returned would be a better solution...?

Can be discussed later on since it's just an improvement over current code.

[twaritwaikar]

Error codes are better than error messages for one more reason. People who can't read in English can easily understand and search for a number, rather than a statement in a language they don't understand