Adds suppliers feature to application

Introduces comprehensive suppliers management with mock data, localization, and UI components

Implements:
- Suppliers page with data table
- Localization for Danish and English
- Search and filtering functionality
- Responsive table design
- Mock data for initial population

PlanTempus.Application/Features/Localization/Translations/en.json

@@ -125,7 +125,7 @@
       "showingCount": "Showing {count} reconciliations",
       "exportSaft": "Export SAF-T",
       "downloadCsv": "Download CSV",
-      "downloadPdf": "Download PDF",
+      "downloadPdf": "Download Z-Report",
       "viewTransactions": "View transactions"
     },
     "revenue": {
@@ -575,6 +575,31 @@
       }
     }
   },
+  "suppliers": {
+    "title": "Suppliers",
+    "subtitle": "Manage suppliers and purchases",
+    "searchPlaceholder": "Search supplier, contact person...",
+    "export": "Export",
+    "create": "New supplier",
+    "emptySearch": "No suppliers match your search",
+    "stats": {
+      "total": "Total suppliers",
+      "active": "Active",
+      "purchasesThisMonth": "Purchases this month",
+      "pendingOrders": "Pending orders"
+    },
+    "column": {
+      "supplier": "Supplier",
+      "contact": "Contact",
+      "products": "Products",
+      "lastOrder": "Last order",
+      "status": "Status"
+    },
+    "status": {
+      "active": "Active",
+      "inactive": "Inactive"
+    }
+  },
   "customers": {
     "detail": {
       "tabs": {