Wikimedia Bugzilla is closed!

Since MediaWiki:categoriespagetext has been set to read:

  "The following categories contain pages or media."

, and empty categories are not listed on the page, I suggest,
to add a link to [[Special:UnusedCategories]] so as to make
users aware that empty categories may exist, and are listed
separately.

Less importantly, I'd also suggest [[Special:WantedCategories]]
to be mentioned.  Result:

  "This special page lists used categories, both created and not.

   * Used but missing categories are separately listed at
      [[{{NS:Special}}:{{int:WantedCategories}}]]
   * Empty, i.e. unused but created, categories are listed at
      [[{{NS:Special}}:{{int:UnusedCategories}}]] only.

   The following categories contain pages or media:"