Get slug of current category in functions.php

get_queried_object is how you retrieve the term for the current category, although you have to be careful to check for this, as it may not be a category archive. It could be a date archive, or a tag archive, etc etc

At a minimum you should include an is_category check:

https://developer.wordpress.org/reference/functions/is_category/

Reading the docs for is_category also reveals it takes a parameter so not only can you check if it’s a category, you can use it to check if it’s a specific category.

You should also look into using locate_template to grab the path to the file rather than dirname( __FILE__ ). This is because the current code has no support for child themes or plugin overrides.

see https://developer.wordpress.org/reference/functions/locate_template/

Another solution would have been to use category-sport-fritid-parent.php and then inside that file called get_template_part to pull in a shared template file.

For reference, here is the official documentation for the filter you’re trying to use:

https://developer.wordpress.org/reference/hooks/type_template/

And post in the comments of that doc is an example doing exactly what you’re asking how to do:

https://developer.wordpress.org/reference/hooks/type_template/#comment-4683

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