Or the other way around: Replace the built-in help files with links to the online documentation. We would probably be better off maintaining documentation in one place - the manual. 

Links to the manual could have "placeholders" for version and language (based on the language chosen by the user). 

The base URL of those links could also be configurable, so a somewhat paranoid library could link to their own local version of the manual, instead of being potentially tracked by a central server.