How can I switch languages on my updated checkout page?

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Topic summary

Topic: Migrating language switching from legacy checkout.liquid to Shopify’s new Checkout Extensibility.

  • Current setup: Store supports 2 languages using the Langify app and applies checkout translations via JS (JavaScript) in checkout.liquid.
  • Planned change: Upgrade to Checkout Extensibility (Shopify’s new extension-based checkout) and need a method to switch between the two languages there.
  • Core question: Is there a supported way to implement language switching/translation on the upgraded checkout?
  • Status: No answers or solutions provided yet; unresolved.
  • Notes: checkout.liquid is the legacy template; Checkout Extensibility replaces it with app-based/customization APIs for checkout.
Summarized with AI on January 11. AI used: gpt-5.
1

Now , we are using langify to support 2 different language in our store , & translate the checkout page by JS in checkout.liquid .

May I know any solution that once I upgrade to new chekcout extensionbility? is there any method can switch between 2 language?