It wouldn't bring much utility.
- The keyboard shortcuts for copy/paste/etc. already work and are well-known. The menu bar likely doesn't need to advertise them.
- There's not very many places you would be able to use these options in the main window (because there's not many places to type stuff in the main window). It would only be applicable on systems with a native menu bar that shows in all other windows as well (but again, the keyboard shortcuts still work).
Also, rename `actionWiki` -> `actionOpenWiki` to match the corresponding `on_actionOpenWiki_triggered`
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