RGB Clear has no language, there are no legends / no text on any of the keys.
You might pick clear because either
You’re a touch typist that doesn’t need letters (or you plan to learn) and you like the cool appearance. It will also look unusual to others and shows off that you don’t need letters.
You want a language other than English in RGB, in which case you can get custom letter decals. You can customize text color, background color, add multiple languages.