This is a picture of the help frame. Help is in English on English systems, but I included the German help files int the Java path. So you can include help in any language, even if you run the editor in English, as above. Of course, it is possible to run the editor in English on a German system, using a command line argument.
The blue lines can be double clicked. They work like hyperlinks, switching to other parts of the same document or even into other documents.
You can edit these help files yourself. The syntax is not HTML, but simpler. There is a special syntax highlighting for help texts, which works differently in edit and in view mode. So you edit the source code of the help.