Add multilang management in ODT models

htdocs/core/class/translate.class.php

...re/modules/commande/doc/doc_generic_order_odt.modules.php

...dules/expedition/doc/doc_generic_shipment_odt.modules.php

...e/modules/facture/doc/doc_generic_invoice_odt.modules.php

...e/modules/project/pdf/doc_generic_project_odt.modules.php

.../modules/propale/doc/doc_generic_proposal_odt.modules.php

htdocs/core/modules/societe/doc/doc_generic_odt.modules.php