fix https://trello.com/c/cWS6fVmm/72-backend-especificar-contingut-newsletter 3
fix https://trello.com/c/cWS6fVmm/72-backend-especificar-contingut-newsletter 3

teclliure/demofony2,teclliure/demofony2,teclliure/demofony2,teclliure/demofony2