@Diddi: hmm good point with coords.info. Currently I made it that Locus Map share link as "url", so it offer open in browser or geocaching4locus. But in the end, it does not make sense. You already have this cache in Locus (because you share it from Locus), so there is no need to open web page or download cache again by this method. So improved and in next version it will be shared as "plain text" so hangout or any text messanger should appear as option to share, thanks.
Problem with greizeitkarte ... hmm "ERR_UNKNOWN_URL_SCHEME" should appear also in case, you tap on "Download to Locus" button in desktop/PC web browser and not on Android device. If this happen in Android itself, what web browser you use?