Handle HTTP errors better

[saifahn]

This probably should be split into a few issues:

• Return errors with messages/payloads from the back end
  • Helps specify the kind of error
• Make a centralized error handling part of the front end
  • Currently, each fetch request needs to handle things

References

• How to handle errors from back-end in front-end and different languages
  • This is a bit more about localization, which I also need, but it talks about adding error codes for each error and then converting the codes based on a table to the right error message based on the language.
• Graceful error handling in REST-driven web applications
  • some tips, adding payload to error responses

[saifahn]

Not a big priority...