Assuming that html has been chosen as the base directory for the multilingual help content, the following structure is possible:
Each content will probably have a directory structure to organize the information. By default the help system builds a tree resembling the directory structure of the help content. In this way there will be an internal node for each subdirectory, and the html documents will be the terminal nodes of the tree.
You can also provide a help.conf configuration file in order to provide more information about the structure of the help. In a help file you can specify a table of contents (TocPage), help subdirectories (HelpDirs) and an index of topics (IndexPage).