eu/iwb/installed_languages is a SAP Parameter attribute which is used to control Info Workbench: Installed Help Languages information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
Indicates the list of languages in which the "Extended Help" of the help
type specified under eu/iwb/help_type is installed. If the current logon
language is not included in this list, the first language listed is used
as an alternative when the Extended Help is displayed.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.