* fix(api): return json for delete + reset-progress
* refactor(api): make .json calls explicit
These .send() calls had objects as arguments. Using .json() makes it
explicit without changing behaviour.
* fix: return json or redirectWithFlash
We should never be getting requests for plain text, but if we do they
should be redirected back to the client.
* fix: prioritize JSON responses
If accepted, respond with JSON. If not, it's probably a bad request.
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