Comment 2 for bug 632361

So, we're going to update the spec to say "failures", and update the code in sca to always return "failures" --- it's returning both currently, failure_reason in "openid_failure" pages, and "failures" in the subscription purchase pages.

The value will remain a string as it is currently, so that it is backwards compatible, but the desktop app will in the future log the message and show a generic failure message instead, as these error messages could be too technical for the end user.

Once this has been updated on production we can mark the bug as affecting the desktop app so they can update their code.