When a specific commonscat does not exist for an archeological monument we should
attempt to use the correct subcategory of Archaeological_monuments_in_Sweden_by_municipality before falling back on "Län", "Landskap" or the top category.
For this we can use self.kommunName (note that not all images with fmis has a kommun).
- Modifications to the default scheme of 'Category:Archaeological monuments in {kommunName} Municipality' will be needed for some municipalities.