Does anyone know how to add flags to the language switcher?
Can it be done somewhere in the admin? or do I have to go into the code?
unfortunately, the default Magento installation does't let you add flags to the language switcher.
But you can use our solution - Store and Currencly Switcher for Magento. It lets you replace the native Magento Store View switcher with a user-friendly Country Switcher with flags on the frontend.
You may check how it works on the demo version of the extension is available >>here<<