show 'revoke_email' in staff action logs

app/models/user_history.rb

@@ -87,7 +87,8 @@ class UserHistory < ActiveRecord::Base
                         :revoke_admin,
                         :grant_moderation,
                         :revoke_moderation,
-                        :backup_operation]
+                        :backup_operation,
+                        :revoke_email]
   end
 
   def self.staff_action_ids

app/services/staff_action_logger.rb

@@ -338,7 +338,7 @@ class StaffActionLogger
     UserHistory.create(params(opts).merge({
       action: UserHistory.actions[:revoke_email],
       target_user_id: user.id,
-      details: user.email
+      details: "Won't be sending emails to '#{user.email}' until #{user.user_stat.reset_bounce_score_after}"
     }))
   end
 

config/locales/client.en.yml

@@ -2450,6 +2450,7 @@ en:
             backup_operation: "backup operation"
             deleted_tag: "deleted tag"
             renamed_tag: "renamed tag"
+            revoke_email: "revoke email"
         screened_emails:
           title: "Screened Emails"
           description: "When someone tries to create a new account, the following email addresses will be checked and the registration will be blocked, or some other action performed."