Uniformize name of standard PDF template

htdocs/admin/fichinter.php

htdocs/core/modules/expedition/doc/pdf_rouget.modules.php

htdocs/core/modules/fichinter/doc/pdf_soleil.modules.php

htdocs/core/modules/modProduct.class.php

htdocs/core/modules/modService.class.php

htdocs/core/modules/product/doc/pdf_standard.modules.php

htdocs/fichinter/admin/fichinter_extrafields.php

htdocs/fichinter/admin/fichinterdet_extrafields.php

htdocs/langs/en_US/main.lang

htdocs/langs/en_US/sendings.lang

htdocs/product/admin/product.php

htdocs/product/class/product.class.php