[Update] added some other authors

src/Controller/ItemController.php

src/Controller/PurchaseProofController.php

src/Entity/Item.php

src/Entity/PurchaseProof.php

src/Form/ItemType.php

src/Form/PurchaseProofType.php

templates/item/edit.html.twig

templates/item/index.html.twig

templates/item/new.html.twig

templates/item/show.html.twig

templates/wishlist/edit.html.twig

templates/wishlist/show.html.twig