Boardgamegeek https://boardgamegeek.com/boardgame/12543/catan-card-game-barbarians-traders-upgrade-kit
English - An expansion set to be used with the cardgame Settlers of Catan (basic set or with one of the 5 old expansion sets), which gives new and powerful possibilities, changing the abilities of the cards from the basic game or from the cards of the other 5 expansion sets.
Ludovox http://ludovox.fr/jeu-de-societe/les-colons-de-catane-barbares-negociants-1311/
French - Un jeu de Klaus Teuber.