Feature Proposal: Server responses should include a key for translations if accept header is application/json

[Joe-Dowd]

Currently, the server responds with plain text English for errors (and without the Accept header should continue to do so for backwards compatibility).

I propose standardising error responses like so:

{
  "status": 403,
  "message": "User is not a VIP."
  "translationKey": "__TranslationKey__"
}

[ajayyy]

Status should not be needed as that is already handled as part of the response

[NDevTK]

Seems like the API should provide the translation when using the standard "accept-language" header.
The key is only useful if the extension already knows about the error.