Added default language pack (en-gb)

admin/extension/module/klarna_checkout_module.php

@@ -0,0 +1,13 @@
+<?php
+// Heading
+$_['heading_title']	   = 'Klarna Checkout';
+
+// Text
+$_['text_extension']   = 'Extensions';
+$_['text_success']	   = 'Success: You have modified module Klarna Checkout!';
+
+//Entry
+$_['entry_status']	   = 'Status';
+
+//Error
+$_['error_permission'] = 'Warning: You do not have permission to modify Klarna Checkout module!';