Rockwell Automation Logix5000 Controllers I/O and Tag Data Programming Manual - Manual (Page 54)

Chapter 2 Organize tags
You can store project documentation for multiple languages in a single project file
rather than in language-specific project files. You define all the localized languages
that the project supports and set the current, default, and optional custom
localized language. The application uses the default language if the current
language's content is blank for a particular component of the project. However,
you can use a custom language to tailor documentation to a specific type of project
file user.
Enter the localized descriptions in your Logix Designer project, either when
programming in that language or by using the import/export utility to translate
the documentation off-line and then import it back into the project. Once you
enable documentation languages in the Logix Designer application, you can
dynamically switch between languages as you use the application.
For more information on enabling a project to support multiple translations of
project documentation, see the online help.
54 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014