To translate the WinShell GUI to another language, follow these steps: 1. Go to the 'Translations' directory. 2. Copy the file 'en.txt' to your language code, like 'xx.txt'. 3. Open the file 'xx.txt' in an editor and translate the english words on the right side. 4. Open the file 'translations.txt' and add the line 'xx : Language'. 5. Start WinShell to check if everything works okay.