1. Create your_language_file.txt (You can translate from English.txt as example, save as UTF-8 without BOM encoding)
2. Put your_language_file.bmp (Your country flag)
3. Open Manifest file with any TextEditor (ex: Notepad++) and insert your language at end-of-file
4. Close Skin tool (if it running), back to main folder and delete Config.xml file
5. Open tool and choose your language form the list