Improve errors messages and handling on the front and backend

[Navnedia]

Now that I've built out a frontend I feel like the error messages returned from the backend could be improved to make them more useful for displaying on the frontend. It would also be nice to make error handling more modular, reusable, and clean. It would be cool if we returned all the errors in the input rather than just the first error we find. After backend error messages are improved I would like to refactor the front end to use these messages more effectively for informing the user of issues.