When you install the language pack, the system checks for the available disk space on the application server. The available disk space in the application server determines the number of languages that you can install. After you install the language pack, the languages in the pack becomes available for use.
You must always install the language packs on servers with the application role. The language packs are site specific. The list of language packs displayed by the Messaging system in User Preferences for a user is dependent on the language packs installed on the application server serving that site. If there is a cluster of application servers for a specific site, then the Messaging system retrieves the list of installed language packs from the first application server. Therefore, you must make sure that you install the same set of language packs on all cluster members.
For more information, see Administering Avaya Aura® Messaging.