feat(landing): Add newsletter double-opt-in

landing/i18n/locales/en.json

@@ -289,8 +289,8 @@
     "description": "Receive updates on the development of GremiumHub and be among the first to learn about new features.",
     "placeholder": "Your email address",
     "submit": "Subscribe",
-    "submitted": "Subscribed!",
-    "success": "Thank you! We'll keep you updated.",
+    "submitted": "Email sent!",
+    "success": "Please confirm your subscription via the link in the email we just sent you.",
     "privacyNote": "By subscribing, you agree to our {link}. We don't send spam.",
     "privacyLink": "Privacy Policy",
     "validation": {
@@ -303,6 +303,15 @@
       "noSpam": "No spam"
     }
   },
+  "newsletterConfirmed": {
+    "meta": {
+      "title": "Newsletter Confirmed – GremiumHub",
+      "description": "Thank you for confirming your newsletter subscription."
+    },
+    "title": "Subscription Confirmed!",
+    "description": "Thank you! You are now subscribed to our newsletter and will receive updates on the development of GremiumHub.",
+    "backToHome": "Back to Home"
+  },
   "expertAccess": {
     "badge": "Expert Network",
     "title": "External Expertise – Directly from the Process",