Make the quota error message friendlier

app/controllers/conversations/messages_controller.rb

@@ -8,7 +8,7 @@ class Conversations::MessagesController < ApplicationController
   def create
     @conversation.ask(question, **message_params)
   rescue Ai::Quota::UsageExceedsQuotaError
-    render json: { error: "You've asked too many questions this week" }, status: :too_many_requests
+    render json: { error: "You've depleted your quota" }, status: :too_many_requests
   rescue Conversation::InvalidStateError
     render json: { error: "Fizzy is still working on an answer to your last question" }, status: :conflict
   end