Fix GETPOST of lang_id

htdocs/comm/propal/card.php

htdocs/comm/propal/class/propal.class.php

htdocs/commande/card.php

htdocs/compta/facture/card.php

htdocs/compta/facture/fiche-rec.php

htdocs/compta/paiement/rapport.php

htdocs/contrat/card.php

htdocs/core/actions_builddoc.inc.php

htdocs/core/actions_lineupdown.inc.php

htdocs/core/actions_massactions.inc.php

htdocs/core/class/commonobject.class.php

htdocs/expedition/card.php

htdocs/expensereport/card.php

htdocs/fichinter/card.php

htdocs/fourn/commande/card.php

htdocs/fourn/facture/card.php

htdocs/fourn/facture/rapport.php

htdocs/fourn/paiement/card.php

htdocs/livraison/card.php

htdocs/product/document.php