refs https://github.com/TryGhost/Team/issues/1613
We use `notifications.showAPIError()` in many of our try/catch routines but those can also pick up standard JS errors which can result in ugly and useless messages showing in alerts.
- added a list of known built-in JS error type names to check against and a generic error message to be used in place of ones we know shouldn't be displayed
- in `showAPIError(obj)` check `obj.name` against the known list and swap the message for a generic one
- only the message is swapped, we still log the full/original error to Sentry
- in `handleNotification(msg)` which is the final method used when displaying any alert/notification, extract all words in the supplied message and check that against the known list and swap the message on a match. This handles situations where the API might give us a raw JS error message in the message string
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