Konsole has an option: General -> "Show application name on the titlebar" which is supposed to suppress the "-- Konsole" titlebar text. At some point in the recent past it completely stopped honoring that option (both F22 and F23, though I don't know if any version of konsole5 in F23 ever worked as I've just recently updated). I can't figure out why this would have happened as the source related to that looks trivial and doesn't seem to have changed recently. Yet I see this issue on different machines using completely different user configurations.
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Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.