Yes, multiple languages and currencies are supported by MageDelight's Magento 2 Extra Fee Extension.

Read this guide on How to Configure Extra Fee Extension in Magento 2 to setup this extension.

Here are the few more resource to help you get most out of this Magento 2 Extra Fee Extension.

• Why Should You Provide Additional Services in Magento 2 Store [& How]
• Boost Revenue with Magento 2 Extra Fee Extension
• Learn More About MageDelight’s Magento 2 Extra Fee Extension Features