refactor: order export enabled + xml xsd usage

bin/backend/controls/panels/Orders.js

@@ -1070,8 +1070,9 @@ define('package/quiqqer/order/bin/backend/controls/panels/Orders', [
                 pagination           : true,
                 exportData           : true,
                 exportTypes          : {
-                    csv : 'CSV',
-                    json: 'JSON'
+                    csv : true,
+                    json: true,
+                    xls : true
                 },
 
                 columnModel: this.$getGridColumnModel(),

events.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<events>
+<events xmlns="https://doc.quiqqer.com/xml/quiqqer-quiqqer-events.xsd">
     <event on="onQuiqqerProductsProductViewButtons"
            fire="\QUI\ERP\Order\EventHandling::onQuiqqerProductsProductViewButtons"
     />
@@ -47,4 +47,4 @@
     <event on="onQuiqqer::products::product::detail::equipment::buttons"
            fire="\QUI\ERP\Order\EventHandling::onDetailEquipmentButtons"
     />
-</events>
\ No newline at end of file
+</events>

locale.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<locales>
+<locales xmlns="https://doc.quiqqer.com/xml/quiqqer-quiqqer-locale.xsd">
 
     <groups name="quiqqer/order" datatype="php,js">
         <locale name="package.title">