Corrected Unknown error message typo

htdocs/comm/action/document.php

htdocs/comm/propal/document.php

htdocs/compta/deplacement/document.php

htdocs/compta/facture/document.php

htdocs/compta/sociales/document.php

htdocs/contrat/document.php

htdocs/fichinter/document.php

htdocs/fourn/facture/document.php

htdocs/langs/en_US/main.lang

htdocs/product/document.php