“Manual” links to some internal page within the software that also seems to not exist (only the text “hjälp:Huvudsida” shows up)
I think I can see what went wrong here: the Swedish translation has not only translated the titles of the links, but also the destinations, which might not be what’s expected. That’s a common issue with badly designed localisation strings, so if that’s the issue here, I expect Audacity has the same problems in some other languages too.
Oh, is that standard procedure? I went to the Audacity website to try to find out where I should report bugs, and Contact | Audacity ® didn’t say anything about GitHub.
I have logged this issue on a section of GitHub reserved for Support and documentation issues:
Logging bugs information on the Audacity website fails to mention raising an issue on GitHub #40