Magor wrote: Is that Wiki-page based on the automatic documentation system you referred to?
And where in the sourcecode is the function that actually writes the html code? I ran Doxygen over the source, but all I found was write_HTML.cc,
That is the place.
Is build-13 outdated in other respects, too?
Yes see the ChangeLog.
Regarding the "po"-directory: I had a look at the files and they look horrible to maintain - is there a dedicated editor available
It is a standard format used by most software, with many editors availabe; KBabel, Lokalize, Emacs, ....