taxonomies: catalan synonyms (#4444)
taxonomies: catalan synonyms (#4444)

* catalan synonyms

* Update additives.txt
openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server,openfoodfacts/openfoodfacts-server