[FIX] point_of_sale: format date on receipt

The date printed on the receipt is not printed according to the language
settings.

opw-769862

addons/point_of_sale/static/src/js/models.js

@@ -1943,6 +1943,8 @@ exports.Order = Backbone.Model.extend({
 
     initialize_validation_date: function () {
         this.validation_date = new Date();
+        this.formatted_validation_date = formats.format_value(
+            this.validation_date, {type: 'datetime'});
     },
 
     set_tip: function(tip) {

addons/point_of_sale/static/src/xml/pos.xml

@@ -1402,7 +1402,7 @@
     <t t-name="PosTicket">
         <div class="pos-sale-ticket">
             
-            <div class="pos-center-align"><t t-esc="moment().format('L LT')"/> <t t-esc="order.name"/></div>
+            <div class="pos-center-align"><t t-esc="order.formatted_validation_date"/> <t t-esc="order.name"/></div>
             <br />
             <t t-esc="widget.pos.company.name"/><br />
             <div class="receipt-phone">