You are the GEDCOM expert and the native speaker.
If card means exclusively index-card then the translation should be “Karteikarte”.
In german Lesezeichen is the common word in context of www.
See: german wikipedia
Favorit is still used by IE and it really sounds like old-fashioned Microsoft-slang. Maybe it’s the same thing in english and wt should update to booksmarks 🙂
Kiwi wrote: In webtrees, are these links to “bookmarks” or are they to “favorite people” ?
I didn’t catch that question :/