Ask your administrator for the version number of the Language Manager plugin.
You find the version number in the administration section (Administration > Manage add-ons > Language Manager)
See the documentation for your release
Language Manager lets you choose from a complete set of all languages. You are not restricted to certain languages or to your installed language packs.
You don't have to translate all of your content. Structure your content in different languages as needed, and only translate what is important.
The app intelligently removes links to deleted language versions that had been linked to each other before. When restoring a page from the trash, those links are restored as well. It also respects authorizations to view pages and only shows links for eligible users.