fix languages

Theme/Backend/Lang/en.lang.php

@@ -47,8 +47,10 @@ return ['Billing' => [
     'Net'             => 'Net',
     'Offer'           => 'Offer',
     'Payment'         => 'Payment',
+    'Postal'          => 'Postal',
     'Prepaid'         => 'Prepaid',
     'Price'           => 'Price',
+    'Profit'          => 'Profit',
     'Quantity'        => 'Quantity',
     'Recipient'       => 'Recipient',
     'Select'          => 'Select',

Theme/Backend/invoice-archive.tpl.php

@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Billing
  * @copyright Dennis Eichhorn

Theme/Backend/invoice-create.tpl.php

@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Billing
  * @copyright Dennis Eichhorn

Theme/Backend/purchase-invoice-list.tpl.php

@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Billing
  * @copyright Dennis Eichhorn

Theme/Backend/sales-bill-list.tpl.php

@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Billing
  * @copyright Dennis Eichhorn
@@ -25,7 +25,7 @@ echo $this->getData('nav')->render(); ?>
             <table id="billList" class="default">
                 <thead>
                 <tr>
-                    <td><?= $this->getHtml('Id', '', ''); ?>
+                    <td><?= $this->getHtml('ID', '0', '0'); ?>
                     <td><?= $this->getHtml('Type'); ?>
                     <td><?= $this->getHtml('ClientID'); ?>
                     <td class="wf-100"><?= $this->getHtml('Client'); ?>

Theme/Backend/sales-bill.tpl.php

@@ -2,7 +2,7 @@
 /**
  * Orange Management
  *
- * PHP Version 7.4
+ * PHP Version 8.0
  *
  * @package   Modules\Billing
  * @copyright Dennis Eichhorn
@@ -26,7 +26,7 @@ echo $this->getData('nav')->render(); ?>
         <ul class="tab-links">
             <li><label for="c-tab-1"><?= $this->getHtml('Invoice'); ?></label></li>
             <li><label for="c-tab-2"><?= $this->getHtml('Items'); ?></label></li>
-            <li><label for="c-tab-3">Preview</label></li>
+            <li><label for="c-tab-3"><?= $this->getHtml('Preview'); ?></label></li>
             <li><label for="c-tab-4"><?= $this->getHtml('Payment'); ?></label></li>
             <li><label for="c-tab-5"><?= $this->getHtml('Media'); ?></label></li>
             <li><label for="c-tab-6"><?= $this->getHtml('Logs'); ?></label></li>