Unify some internal error message wordings

Peter Eisentraut <peter@eisentraut.org>

Commit: b5621b66e778112c78d381414dff8917320f71d2
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-11-08T17:45:29Z
Releases: 16.0
Unify some internal error message wordings

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