링크결제 신청 페이지 다국어 지원 추가

- 링크결제 신청, 확인, 완료 페이지 현지화
- 메시지 미리보기 텍스트 번역
- 에러 메시지 및 버튼 다국어 적용
- 한글/영문 번역 키 추가

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/locales/en.json

@@ -1043,6 +1043,15 @@
             "applyTitle": "Link Payment Request",
             "messagePreview": "Message Preview",
             "separateApprovalTitle": "Separate Approval Detail",
+            "previous": "Previous",
+            "next": "Next",
+            "requestProcessingError": "Unable to process request.",
+            "requestError": "An error occurred during request",
+            "confirmSendMessage": "Please confirm\nthe message to be sent",
+            "paymentRequestComplete": "Payment request has been completed.",
+            "merchantName": "Merchant Name",
+            "customerGreeting": "Hello, {buyerName}!",
+            "paymentGuideMessage": "NICEPAYMENTS Co., Ltd. is notifying you\nof the payment details.\nYou can check the details and proceed with payment by accessing the URL below.",
             "resendSuccess": "Resend successful.",
             "resendFailed": "Resend failed.",
             "resendError": "An error occurred during resend.",