Please change extension and skins that have namemsg set like in this format and change
extensionname-<extensionname>
to
<repositoryname>-extensionname
Including skins.
Per https://www.mediawiki.org/wiki/Manual:$wgExtensionCredits#namemsg
Affected extensions: all fixed.
Skins:
- apex
- MonoBook
- Metrolook
- Nostalgia
- Slate
- Vector