Added default language pack (en-gb)

catalog/tool/upload.php

@@ -0,0 +1,8 @@
+<?php
+// Text
+$_['text_upload']    = 'Your file was successfully uploaded!';
+
+// Error
+$_['error_filename'] = 'Filename must be between 3 and 64 characters!';
+$_['error_filetype'] = 'Invalid file type!';
+$_['error_upload']   = 'Upload required!';