Translations:Help:Tracking categories/2/en

What category to use is determined by the tracking category's system message, that is, a page in MediaWiki namespace. If the message is a single hyphen-minus (-), then the tracking category is disabled. Often wiki admins mark such categories as hidden (using the $2 magic word), since they are meant for maintenance and not general consumption. Some sites use Parser functions to modify which category is used based on namespace, but that doesn't work properly until 1.19.