feat: add multilingual support for print preview empty state

Add i18n support for empty state when no barcode data is found:

**English translations:**
- "No Barcode Data Found" 
- "No bills with 2D barcodes found for {yearMonth}"

**Croatian translations:**
- "Nema Podataka o Barkodovima"
- "Nema računa s 2D barkodovima za {yearMonth}"

**Implementation:**
- Add translation keys to messages/en.json and messages/hr.json
- Update server component to fetch empty state translations
- Use proper next-intl parameter passing for yearMonth variable
- Replace hardcoded English text with localized translations

Empty state now displays correct language based on URL locale:
- /en/print/2025/01 → English empty state message
- /hr/print/2025/01 → Croatian empty state message

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

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

app/[locale]/print/[year]/[month]/page.tsx

@@ -31,6 +31,7 @@ export default async function PrintPage({ params }: PrintPageProps) {
 
   // Get translations for the current locale
   const t = await getTranslations("home-page.print-preview");
+  const yearMonth = `${year}-${month.toString().padStart(2, '0')}`;
   const translations = {
     title: t("title"),
     barcodesFound: t("barcodes-found"),
@@ -39,7 +40,9 @@ export default async function PrintPage({ params }: PrintPageProps) {
     printFooter: t("print-footer", { date: new Date().toLocaleDateString() }),
     tableHeaderIndex: t("table-header-index"),
     tableHeaderBillInfo: t("table-header-bill-info"),
-    tableHeaderBarcode: t("table-header-barcode")
+    tableHeaderBarcode: t("table-header-barcode"),
+    emptyStateTitle: t("empty-state-title"),
+    emptyStateMessage: t("empty-state-message", { yearMonth })
   };
 
   // If no barcode data found, show empty state
@@ -47,9 +50,9 @@ export default async function PrintPage({ params }: PrintPageProps) {
     return (
       <div className="min-h-screen flex items-center justify-center">
         <div className="text-center">
-          <h1 className="text-2xl font-bold mb-4">No Barcode Data Found</h1>
+          <h1 className="text-2xl font-bold mb-4">{translations.emptyStateTitle}</h1>
           <p className="text-gray-600">
-            No bills with 2D barcodes found for {year}-{month.toString().padStart(2, '0')}
+            {translations.emptyStateMessage}
           </p>
         </div>
       </div>