At the end of the Icinga Web 2 setup procedure, there's a nice welcome greeting.
Since there's no database name in the [original message], there's no text that could be replaced by the %s.
This is untested. Please let me know if there are other lines/files that have to be changed in order to make this work.
Kind regards,
Bernd
[original message] 81bb5272b5/modules/setup/library/Setup/Steps/DatabaseStep.php (L252)