We have a client that wants to use Spanish as the default language when they login to the admin interface. I added Spanish to the core and master database. Then I set a user's defaults to it but when they login all of the words are blank. I saw that if I go into the core database and add versions for Spanish and update the name for an item like "Preview". Then it would show up.
Do I have to go to every item in the core database and add a Spanish version and update the display name for the admin interface to show in Spanish? Is there an easier way or a package I can download instead?
It is on Sitecore 8.2 Update 6.