New: Allow to use ODT templates for prososal like it's done for invoices

htdocs/admin/commande.php

htdocs/admin/facture.php

htdocs/admin/modules.php

htdocs/admin/propale.php

htdocs/core/lib/files.lib.php

htdocs/core/modules/DolibarrModules.class.php

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

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

htdocs/core/modules/modCommande.class.php

htdocs/core/modules/modFacture.class.php

htdocs/core/modules/modPropale.class.php

htdocs/core/modules/modSociete.class.php

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

htdocs/install/doctemplates/proposals/template_proposal.odt

htdocs/install/etape1.php

htdocs/langs/en_US/errors.lang

htdocs/langs/fr_FR/errors.lang

test/phpunit/AdherentTest.php

test/phpunit/BuildDocTest.php

test/phpunit/CMailFileTest.php