Template:Decade television films category/doc

Creates a category of the form "YYY0s television films", where YYY0s is a 4-digit decade.

e.g.
 * Category:1940s television films ✅
 * Category:1970s television films ✅
 * Category:2000s television films ✅

It is not for use on other types of categories, e.g.


 * Category:1930s in television ❌
 * Category:1960s in television by country ❌
 * Category:2010s films ❌

Usage
No parameters needed

Errors
If the template is used on an invalid page, an error message is generated and the page is categorised in:
 * Category: (population: )

Errors include:


 * The page is not in the category namespace
 * The page's title does not take the form "YYY0s television films"