Template:Fooers at the YYYY Winter Olympics category/doc

Category header template for categories of the form "Fooers at the YYYY Winter Olympics", e.g. Category:Alpine skiers at the 2018 Winter Olympics or Category:Bandy players at the 1952 Winter Olympics

Creates:
 * a category header, including location
 * a navbox to other years,
 * a "see also" link to the articles on " at the YYYY Winter Olympics" (if it exists)
 * parent categories.

Needs no parameters.

Error tracking
If the template cannot derive out the sport from the category name, and error message is generated, and the category is placed in Category:Fooers at the YYYY Winter Olympics category with unknown sport (population: )