Feature: Send chat transcript via email (#1152)

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

config/locales/en.yml

@@ -56,3 +56,4 @@ en:
       email_input_box_message_body: "Get notified by email"
     reply:
       email_subject: "New messages on this conversation"
+      transcript_subject: "Conversation Transcript"

config/routes.rb

@@ -54,6 +54,7 @@ Rails.application.routes.draw do
             end
             member do
               post :mute
+              post :transcript
               post :toggle_status
               post :toggle_typing_status
               post :update_last_seen
@@ -117,6 +118,7 @@ Rails.application.routes.draw do
           collection do
             post :update_last_seen
             post :toggle_typing
+            post :transcript
           end
         end
         resource :contact, only: [:update]