Superhero must be compatible with the most used plugins in order for users to have a good experience with it.
If your website is multilingual, you have several languages. WPML is one of them. A paid plugin, WPML offers plenty of options. With this plugin and Superhero, you can have a separate Theme Option for every language. Read this article to find out more. Also, you can have different Widgets for every language with the help of another plugin.
This is one of the best plugins if you want an ecommerce website with your WordPress installation.
In Superhero go to the page that is the main shop page from the Woocommerce Settings and there, use the Superhero Page Options and do the changes you wish. Also, you also have a big set of options at the Theme Options - Woocommerce section.
Also, Superhero supports specific shortcodes. You can see them in the Visual Composer or click here to see the list.
Contact Form 7
This is a very good solution that you can find for free. Click here to learn more about that. It is a proper plugin if you wish to do more complex changes with your forms. All you have to do is install and configure it.
This is a good alternative if you wish to spend some money in order for the website to look more professional. You should know the Superhero theme accepts this plugin and displays it nicely.