Category:Hidden categories

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de:Kategorie:Versteckte Kategorien
en:Category:Hidden categories
es:Categoría:Categorías ocultas
fr:Catégorie:Catégories cachées
ru:Категория:Скрытые категории
Translation to review
Don't blame the contributors, but come and help them 😎

Reference text ( Maintained text, used as reference ) :
Notes: (Zorroargh, 2020-07-09)

Various technical categories known as Hidden Categories, mainly for maintenance. These categories contain   __HIDDENCAT__  in the source code.