I came across this while translating. Either "servname not supported for ai_socktype" has a typo (servname => servername), or there should be a comment for translators to explain that this is a parameter name. According to the po file, the string is located in kdecore/netsupp.cpp:877
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.
kdelibs4support was already in pure maintenance mode in kf5, for kf6 it got removed, there will be no future work spend on this beside critical security issues, if at all.