I stumbled upon some http-URL by accident and thought "let's change it'. Then got surprised how many there still are :(.
Interestingly, I left out the most user visible one: https://github.com/geany/geany/blob/master/src/about.c#L453
This would cause a fuzzy translation in each language file. In theory, we could remove the fuzzy marker and update the translated version in each language file. But I would do this rather *after* the next release to not unnecessarily bother translators who are currently at updating their language.