This does not work in the footer section.
Regards @Bmrberlin
Well, the license link and PoweredBy icon are examples ;)
Feel free to report it as a bug, Surprisingly, I haven't seen it reported yet. That seems to be controlled in the parser, and those footer links aren't passed through the parser. The same was happening for sidebar links (task T31533), which needed to be coded specifically for this.
There's also a script in Extension:LaunchExternal#Recommended_Script_for_.22outside_links_only....22
The link "Bedingung: Namensnennung - Nicht kommerziell - Keine Bearbeitungen" now opens on a new window, but not the footer icons. I've updated the script to include those.
I've reported the bug: task T109979