ref: https://github.com/medusajs/medusa/pull/14189
**Summary**
This PR extends the translation module to support automatic translation syncing for cart line items based on the cart's locale.
Key changes:
- Added locale field to the Cart model to store the cart's locale preference
- Created new workflow steps:
- getTranslatedLineItemsStep - Translates line items when adding to cart or creating a cart
- updateCartItemsTranslationsStep - Re-translates all cart items when the cart's locale changes
- Integrated translation logic into cart workflows:
- createCartWorkflow - Applies translations to initial line items
- addToCartWorkflow - Applies translations when adding new items
- updateCartWorkflow - Re-translates all items when locale_code is updated
- refreshCartItemsWorkflow - Maintains translations during cart refresh
- Added applyTranslationsToItems utility to map variant/product/type/collection translations to line item fields (title, subtitle, description, etc.)
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