🤖 Sync Liquid Docs Translations (#445)

Co-authored-by: shopify-dev-bot[bot] <95105344+shopify-dev-bot[bot]@users.noreply.github.com>

data/shopify_system_translations.json

@@ -443,6 +443,7 @@
  "shopify.checkout.order_summary.calculating_shipping": "Calculating…",
  "shopify.checkout.order_summary.calculating": "Calculating…",
  "shopify.checkout.order_summary.shipping_default_value": "Calculated at next step",
+ "shopify.checkout.order_summary.shipping_discount_title": "Shipping Discount",
  "shopify.checkout.order_summary.shipping_pending_value": "—",
  "shopify.checkout.order_summary.shipping_pending_message": "Not yet available",
  "shopify.checkout.order_summary.shipping_policy_link": "Shipping costs",
@@ -674,6 +675,7 @@
  "shopify.checkout.payment.card_information_notice": "All transactions are secure and encrypted. Credit card information is never stored.",
  "shopify.checkout.payment.name_on_card_label": "Name on card",
  "shopify.checkout.payment.name_on_card_placeholder": "Name on card",
+ "shopify.checkout.payment.card_nickname_label": "Nickname (optional)",
  "shopify.checkout.payment.card_expired": "Expired",
  "shopify.checkout.payment.card_expiry_label": "Expiration date (MM \/ YY)",
  "shopify.checkout.payment.card_expiry_placeholder": "Expiration date (MM \/ YY)",