app: remove the "save your work and restart" advice on fatal errors.
This is obviously not possible anymore to do this manually so this step is bogus in a crash case. We keep this step for other (non-fatal) errors. We may add an automatic "attempt" to save in a backup file later, which may not work depending on how bad the crash is (which is why it will be done in a backup file, we don't want to corrupt saved files).
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