SOLR-7382 reported a partials directory that was misplaced. The files in this dir should, actually, be in solr/webapp/web/partials. I'll attached a patch.
Admin UI - Refactoring using AngularJS
Uber-patch for AngularJS admin UI
Closed as part of: SOLR-7558
Partials (templates) required for documents, files and plugins tabs on AngularJS admin UI.