OX6:Installing OX Language Packages
From Open-Xchange
Installing Open-Xchange Server Language Packages
Where to get the language packages?
The packages are contained in the standard Open-Xchange installation repositories.
For a complete list of currently available languages, have a look at Available_Translations.
How to install?
Use the package manager from your preferred distribution to search for packages with names
open-xchange-lang* open-xchange-gui-lang*