Added default language pack (en-gb)

catalog/account/newsletter.php

@@ -0,0 +1,11 @@
+<?php
+// Heading
+$_['heading_title']    = 'Newsletter Subscription';
+
+// Text
+$_['text_account']     = 'Account';
+$_['text_newsletter']  = 'Newsletter';
+$_['text_success']     = 'Success: Your newsletter subscription has been successfully updated!';
+
+// Entry
+$_['entry_newsletter'] = 'Subscribe';