Hi 
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Nope, sorry, there’s no way I’m aware of to (easily) change the ‘Next’ button when using *choice or *fake_choice. It would involve messing with the JavaScript side of things (probably the ui.js file or similar) so unless you know precisely what you’re doing with that… Maybe somebody else can explain it.
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This Wiki page should help explain your options. It’s worth noting that if you use CSIDE to develop your game there’s an option available to easily “compile” the game as a single HTML file, either for uploading or sending to beta testers.