Magento 2 Language and Store Switcher Extension

Yes, it does. To make the module work properly with the varnish cache you need to modify the Varnish Cache configuration file (by default /etc/varnish/default.vcl) on your server and restart varnish. Please add these lines of code to the varnish config file:

if (req.http.cookie !~ "PHPSESSID=" && req.http.User-Agent !~ "bot" && req.http.User-Agent !~ "loader") {
 return (pass);
 }

With this setting, your store will be displayed without varnish cache during the first visit. You need to do this as the GeoIP detections held on the PHP level, and you need to allow varnish to skip the first visitor's request to make GeoIP detection possible. Check Magefan Blog Extension - Blog Post Link for more information.

Yes, you can. All our modules can be installed via the composer. Once you purchase the extension, you receive keys to the private Magefan composer repository and find the composer installation commands available in the "My Downloads" section.

Yes, Magento supports multi-language and allows you to create multiple store views in different languages. You can set locales for these store views, install the language packs and translate Magento 2 pages.

Language Switcher is a default Magento functionality. When you create store views in the admin panel they appear in the store switcher on the storefront.

To change default language in Magento 2 frontend go to Stores > Configuration and switch to the store view you want to change the language for. Then set the default language in General > Locale Options > Locale section.