Unify error messages

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 0a999e1290fc9d8708da61017e732380bc9239a3
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2019-04-24T13:26:13Z
Releases: 12.0
Unify error messages

... for translatability purposes.

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