Added default language pack (en-gb)

admin/extension/report/sale_coupon.php

@@ -0,0 +1,25 @@
+<?php
+// Heading
+$_['heading_title']    = 'Coupons Report';
+
+// Text
+$_['text_extension']   = 'Extensions';
+$_['text_edit']        = 'Edit Coupons Report';
+$_['text_success']     = 'Success: You have modified coupon report!';
+$_['text_filter']      = 'Filter';
+
+// Column
+$_['column_name']      = 'Coupon Name';
+$_['column_code']      = 'Code';
+$_['column_orders']    = 'Orders';
+$_['column_total']     = 'Total';
+$_['column_action']    = 'Action';
+
+// Entry
+$_['entry_date_start'] = 'Date Start';
+$_['entry_date_end']   = 'Date End';
+$_['entry_status']     = 'Status';
+$_['entry_sort_order'] = 'Sort Order';
+
+// Error
+$_['error_permission']  = 'Warning: You do not have permission to modify coupon report!';