Do not deactivate wiki module after wiki_page#destroy, instead preserve menu item of last wiki page
Create a fresh wiki menu item after the page with the last main item has been deleted
Also include the current wiki page and its children for main item replacement
Fix wiki menu items controller spec
Add labels for wiki menu item breadcrumb
Add explanation text to wiki menu item select
Update English localization of explanation of main wiki menu item replacement
Fix typo in wiki spec
Extend wiki menu items controller spec
Fix error on double click when replacing main wiki menu items
Discard specific css for wiki menu item replacement hint
Do nothing when replacing a wiki menu item with itsself
Ensure a wiki menu item has to be replaced when it is the last one...


... and that it cannot be replaced if there is no candidate for replacing it.
Update CHANGELOG.md

after respecification of #2363