FIX : remove deprecated property 'libelle' on product object

dev/examples/create_product.php

dev/initdata/generate-produit.php

htdocs/categories/categorie.php

htdocs/categories/viewcat.php

htdocs/commande/class/commande.class.php

htdocs/fourn/commande/card.php

htdocs/fourn/facture/card.php

htdocs/fourn/product/categorie.php

htdocs/fourn/product/photos.php

htdocs/margin/productMargins.php

htdocs/margin/tabs/productMargins.php

htdocs/product/card.php

htdocs/product/class/product.class.php

htdocs/product/composition/card.php

htdocs/product/document.php

htdocs/product/fournisseurs.php

htdocs/product/photos.php

htdocs/product/price.php

htdocs/product/stats/card.php

htdocs/product/stats/commande.php