Fix css class opacitymedium was not used everywhere.

htdocs/accountancy/admin/fiscalyear.php

htdocs/admin/system/filecheck.php

htdocs/comm/index.php

htdocs/comm/mailing/index.php

htdocs/compta/bank/index.php

htdocs/compta/deplacement/index.php

htdocs/compta/facture.php

htdocs/compta/index.php

htdocs/compta/paiement/cheque/list.php

htdocs/compta/prelevement/create.php

htdocs/compta/resultat/clientfourn.php

htdocs/core/class/html.formfile.class.php

htdocs/core/lib/company.lib.php

htdocs/core/modules/printing/printgcp.modules.php

htdocs/expensereport/index.php

htdocs/fourn/facture/card.php

htdocs/hrm/admin/admin_establishment.php

htdocs/hrm/hrm.php

htdocs/product/composition/card.php

htdocs/user/card.php