Something got wrong in [[Template:Doc-group]]

CLOSED This issue is closed by Nike

Tracked

Why I can see

This message contains the page name of the page with more information about this group. Please leave {{ns:project}} untranslated. The page title is generally equal to the group name ({{msg-mw|group-{Template:1). {{#ifeq:Template|MediaWiki|{{#ifeq:MediaWiki:{{ucfirst:grouppage-{Template:1/qqq|Template:Doc-group|| |member=
...
{{#ifeq:Template|MediaWiki|{{#ifeq:MediaWiki:{{ucfirst:group-{Template:1.js/qqq|Template:Doc-group|| |css=
...
{{#ifeq:Template|MediaWiki|{{#ifeq:MediaWiki:{{ucfirst:group-{Template:1.css/qqq|Template:Doc-group|| |group |=
...
Form should be plural. {{#ifeq:Template|MediaWiki|{{#ifeq:MediaWiki:{{ucfirst:group-{Template:1/qqq|Template:Doc-group|| |#default=

What means Template:1?

That is https://phabricator.wikimedia.org/T153761