Add beta-only access alert to jumbo

Public registrations are paused; surface a signup form on the homepage
hero that subscribes users to the beta tester list.

i18n/en.yaml

@@ -255,6 +255,13 @@
 - id: cta-account-button
   translation: "Create my online space"
 
+- id: beta-alert-title
+  translation: "Online version closed, beta access only"
+- id: beta-alert-text
+  translation: "Public registrations are paused. Join the beta program to get early access."
+- id: beta-alert-button
+  translation: "Join the beta"
+
 - id: cta-newsletter-title
   translation: "Stay a step ahead!"
 - id: cta-newsletter-text

i18n/fr.yaml

@@ -254,6 +254,13 @@
 - id: cta-account-button
   translation: "Créer mon espace en ligne"
 
+- id: beta-alert-title
+  translation: "Version en ligne fermée, accès bêta uniquement"
+- id: beta-alert-text
+  translation: "Les inscriptions publiques sont suspendues. Rejoignez le programme bêta pour un accès anticipé."
+- id: beta-alert-button
+  translation: "Rejoindre la bêta"
+
 - id: cta-newsletter-title
   translation: "Gardez une longueur d'avance !"
 - id: cta-newsletter-text