This task is about MediaWiki's Translate extension.
If you go to
When you go to
dc1367ef78ddcdf201dab9d8e6634f99216c6e17 has an example how to do it. Basically you need to add such HTML element and the CSS to the appropriate CSS/LESS file. The
i18n (internationalization) message can be reused.
Special:AggregateGroups the listing should remain, but without all those boxes that are used for editing.