The third step is to design a user-friendly interface that can accommodate different languages and cultures. This means taking into account factors such as text direction, font size, layout, color, icons, images, symbols, date and time formats, currency, units, etc. You'll need to make sure that your web app's interface can adapt to these variations without breaking or losing functionality.
One way to achieve this is to use responsive design principles that can adjust your web app's layout and elements according to the screen size and resolution. Another way is to use internationalization best practices that can avoid hard-coding language-specific elements and allow easy customization and substitution.