Each Autodesk product is installed with a default language. A language pack is a mechanism used to provide another language for the Revit user interface and the documentation. A single installed product can support several languages, enabling users to switch from one to another when required.
Each language pack contains the text strings and documents required to support a user working in the specified language; it does not duplicate the core Revit software.
In addition, when installing a language pack, you can install Revit content for the language and region.
For each user, the Revit software uses a single Revit.ini file, stored in the user profile folder. All language packs use the settings defined in that Revit.ini file.
Revit language packs include the following:
For online help (when connected to the Internet), by default users go to the Revit help site for the language that corresponds to the language pack being used. If you always want to access online help for a particular language, regardless of the language pack being used, edit the Revit.ini file to define the OnlineHelpLocale setting in the Documentation section.