I've looked at several pages regarding adding another language support to the Magento cart, however, there seems to be something missing.
The usual is to download translation through the admin interface.... Then Create a Store View and set the Locale to the desired language. This doesn't appear to work as I have tried adding Russian language support only to find that the switch causes the site to come out with error and become inaccessible.
I remember about a year ago finding some mentions of the directories that needed to be created on the server in order for the language to be available.