feat: API to allow agents to delete a message (#1353)

config/locales/en.yml

@@ -46,6 +46,8 @@ en:
     period: Reporting period %{since} to %{until}
 
   conversations:
+    messages:
+      deleted: This message was deleted
     activity:
       status:
         resolved: "Conversation was marked resolved by %{user_name}"

config/routes.rb

@@ -49,7 +49,7 @@ Rails.application.routes.draw do
             get 'meta', on: :collection
             get 'search', on: :collection
             scope module: :conversations do
-              resources :messages, only: [:index, :create]
+              resources :messages, only: [:index, :create, :destroy]
               resources :assignments, only: [:create]
               resources :labels, only: [:create, :index]
             end