The Challenge Die Kelten/The Celts is a bit tricky. The checker must do the following:
- Checking for the words "Kelten*", "Keltisch*", "Celts", "celtic", "grave mound", "Hügelgrab"...
- Checking for caches in the bookmarklist Kelten
- Found at least in 5 countries or states
- Found at least 20 caches
Is it possible to write a checker for that? It's clear, the checker will never find all Celtic caches, but it could be helpful to start the challenge.