Added default language pack (en-gb)

admin/extension/payment/pp_express_refund.php

@@ -0,0 +1,21 @@
+<?php
+// Heading
+$_['heading_title']		   = 'Refund Transaction';
+
+// Text
+$_['text_pp_express']	   = 'PayPal Express Checkout';
+$_['text_current_refunds'] = 'Refunds have already been done for this transaction. The max refund is';
+$_['text_refund']		   = 'Refund';
+
+// Entry
+$_['entry_transaction_id'] = 'Transaction ID';
+$_['entry_full_refund']	   = 'Full refund';
+$_['entry_amount']		   = 'Amount';
+$_['entry_message']		   = 'Message';
+
+// Button
+$_['button_refund']		   = 'Issue refund';
+
+// Error
+$_['error_partial_amt']	   = 'You must enter a partial refund amount';
+$_['error_data']		   = 'Data missing from request';