Added default language pack (en-gb)

admin/extension/openbay/ebay_usage.php

@@ -0,0 +1,11 @@
+<?php
+// Headings
+$_['heading_title']   = 'Usage';
+$_['text_openbay']    = 'OpenBay Pro';
+$_['text_ebay']       = 'eBay';
+
+// Text
+$_['text_usage']      = 'Your account usage';
+
+// Errors
+$_['error_ajax_load'] = 'Sorry, could not get a response. Try later.';