feat: implement success page and update routing; add lucide icons and enhance form submission feedback

frontend/src/utils/i18n/locales/en/en.json

@@ -2,7 +2,6 @@
     "first-name": "First Name",
     "last-name": "Last Name",
     "phone-number": "Phone Number",
-    "tickets": "Tickets",
     "invoice": "Invoice",
     "company-name": "Company Name",
     "street": "Street + House No.",
@@ -18,5 +17,11 @@
     "error": "Error",
     "cash": "Cash",
     "paypal": "PayPal",
-    "transfer": "Bank Transfer"
+    "transfer": "Bank Transfer",
+    "ticket-payment_one": "You have successfully purchased {{count}} ticket.",
+    "ticket-payment_other": "You have successfully purchased {{count}} tickets.",
+    "ticket": "ticket",
+    "tickets": "tickets",
+    "entry-id": "Entry ID",
+    "thank-you": "Thank you for supporting the Claudius Akademie! We wish you the best of luck with your ticket."
 }