Add a publish button in the contextual menu

To add a publish button in the contextal menu as in the screenshot below it is very simple:

1. Open the core database
2. Go to the item /sitecore/content/Applications/Content Editor/Context Menues/Default and duplicate the item Insert for example
3. Set the fields values to:
1. Display Name: Publish Item
2. Message: item:publish(id=$Target)