feat: i18n for choice prompt via promptKey, with fallback

public/demo/locales/en.json

@@ -11,6 +11,9 @@
     "choice": {
       "handshake": "Shake hands with the stranger",
       "reject": "Refuse to shake, stay alert"
+    },
+    "prompt": {
+      "handshake": "The stranger will remember your kindness"
     }
   },
   "right_door": {
@@ -26,6 +29,9 @@
     "choice": {
       "journey": "Embark on a journey of trust (requires trust >= 80)",
       "leave": "Leave this place"
+    },
+    "prompt": {
+      "journey": "Your bond will change everything"
     }
   },
   "investigation_site": {