Created attachment 9667 clipman-settings-dialog Clipman Settings title is not translatable. I use the application in Turkish, but it appears in English in the window title and bar below it. I think the problem was caused by the thirtieth line of the settings-dialog.ui file https://git.xfce.org/panel-plugins/xfce4-clipman-plugin/tree/panel-plugin/settings-dialog.ui#n30
Simon Steinbeiss referenced this bugreport in commit 53c113c6d4a1a4eabf968fd4ff3e60aaff302552 Make settings window title translateable (Bug #16625) https://git.xfce.org/panel-plugins/xfce4-clipman-plugin/commit?id=53c113c6d4a1a4eabf968fd4ff3e60aaff302552
Thanks for noticing, fix pushed.