[REQUEST] Use vectorbased coloring of regions instead of a marker

[Ave-Rechts]

Is your feature request related to a problem? Please describe.
When u mark a region as visited and u go look on the map, it is shown as a single marker. This doesn't really showcase properly where this region is situated.

Describe the solution you'd like
When a region is visited and u want to see these on the world map, the entire region should be filled with a 50% opacity or something. This makes it more clear, more visually appealing as well.

Additional context
Had a small discussion with Sean already. We probably need to find a GeoJSON db somewhere that already has this information. No need to reinvent the wheel on this data.