[IMP] purchase: improve the purchase order report.

The purpose of this commit is, remove "our order reference" because it is already in the title, replace purchase order confirmation by purchase order and add the purchase representative.

Task Id #1902886

closes odoo/odoo#31099

Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>

addons/purchase/report/purchase_order_templates.xml

@@ -23,13 +23,13 @@
 
             <h2 t-if="o.state == 'draft'">Request for Quotation #<span t-field="o.name"/></h2>
             <h2 t-if="o.state in ['sent', 'to approve']">Purchase Order #<span t-field="o.name"/></h2>
-            <h2 t-if="o.state in ['purchase', 'done']">Purchase Order Confirmation #<span t-field="o.name"/></h2>
+            <h2 t-if="o.state in ['purchase', 'done']">Purchase Order #<span t-field="o.name"/></h2>
             <h2 t-if="o.state == 'cancel'">Cancelled Purchase Order #<span t-field="o.name"/></h2>
 
             <div id="informations" class="row mt32 mb32">
-                <div t-if="o.name" class="col-3 bm-2">
-                    <strong>Our Order Reference:</strong>
-                    <p t-field="o.name" class="m-0"/>
+                <div t-if="o.user_id" class="col-3 bm-2">
+                    <strong>Purchase Representative:</strong>
+                    <p t-field="o.user_id" class="m-0"/>
                 </div>
                 <div t-if="o.partner_ref" class="col-3 bm-2">
                     <strong>Your Order Reference:</strong>