Change Error Messages Sent In Api

Hi there!

We currently have a website and in progress of developing an application.

In the app, when the user logs in with incorrect credentials then a 404 status with some message is sent, which actually gives the user no idea what went wrong.

This is one example. Many other APIs are giving a very generalized status and message.

Hence I want to know a way by which we can change the error messages that are sent in response in API.

Currently getting - (after wrong credentials)

"message": "Not Found",
"status": 404

Also if you have any answer please keep in mind that it has to be language dependent.