More complete tooltip help to describe available substitution vars

htdocs/admin/chequereceipts.php

htdocs/admin/commande.php

htdocs/admin/contract.php

htdocs/admin/expedition.php

htdocs/admin/expensereport.php

htdocs/admin/facture.php

htdocs/admin/fichinter.php

htdocs/admin/livraison.php

htdocs/admin/payment.php

htdocs/admin/propal.php

htdocs/admin/supplier_invoice.php

htdocs/admin/supplier_order.php

htdocs/admin/supplier_proposal.php

htdocs/compta/facture/admin/facture_cust_extrafields.php

htdocs/compta/facture/admin/facturedet_cust_extrafields.php

htdocs/fourn/card.php

htdocs/langs/en_US/companies.lang

htdocs/societe/agenda.php

htdocs/theme/eldy/style.css.php

htdocs/theme/md/style.css.php