Fix: Corrections de quelques bugs

htdocs/categories/categorie.php

htdocs/comm/prospect/fiche.php

htdocs/compta/facture.php

htdocs/facture.class.php

htdocs/html.form.class.php

htdocs/includes/modules/modFournisseur.class.php

htdocs/includes/modules/modSociete.class.php

htdocs/langs/en_US/admin.lang

htdocs/langs/fr_FR/admin.lang

htdocs/lib/functions.inc.php

htdocs/societe.php

htdocs/user/perms.php