"Unsubscribe" the user from the newsletter language, not the current …

…language. (#2150)

When a tipline user is interacting with the bot in a certain language but clicks on the "Unsubscribe" button from a newsletter, the affected subscription should be the one related to the newsletter language, not the current language.

So, the first here is to use the language stored in the delivered message reference, not the current language, which is still used as a fallback.

Fixes: CV2-5252.

app/models/concerns/smooch_resend.rb

@@ -118,7 +118,7 @@ def get_information_from_clicked_template_button(message, delete = false)
         info = Rails.cache.read("smooch:original:#{quoted_id}").to_s
         begin
           original = JSON.parse(info)
-          info = ['newsletter'] if original['fallback_template'] == 'newsletter'
+          info = ['newsletter', original['language']] if original['fallback_template'] == 'newsletter'
         rescue
           info = info.split(':')
         end
@@ -138,6 +138,7 @@ def template_button_click_callback(message, uid, language)
         self.send_message_on_template_button_click(message, uid, language, info)
       when 'newsletter'
         team_id = self.config['team_id'].to_i
+        language = info[1] || language
         self.toggle_subscription(uid, language, team_id, self.get_platform_from_message(message), self.get_workflow(language)) if self.user_is_subscribed_to_newsletter?(uid, language, team_id)
       end
     end