Translate & Adapt is one of the apps developed directly by the Shopify team. It allows you to translate and manage translations for all your products, collections, storefront, and content (i.e., blog posts, metadata). The app interface and is nicely integrated within your store admin, using the full screen display when managing actual translations.

As an app user, you are eligible for two free automatic translations generated via Google Translate. The app works really well with Shopify Markets.

Unfortunately, the app doesn't offer any advanced features like translations import/export or integration with professional services. That means the managing multiple languages using the app can be challenging.

Using the app itself is completely free and highly recommended as it provides native support for managing your store languages.