About [[MediaWiki:Admanager noadsset/en]]
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Undocumented, ambiguous $1 (lacking grammar context). Also this message doesn't seem to be actually used in the extension (it doesn't grep).
This extensions seems to be unmaintained.
See duplicate Thread:Support/About_MediaWiki:Admanager_noadsset/en.
Looks like this particular message is unused from that thread.