Feature summary (what you would like to be able to do and where):
After discussing T340606: Decide what to do about the edit-form's hidden categories list I’ve tried looking into some of the ways a person can discover hidden categories and discovered that currently, the list of page properties on action=info page is borderline unreadable on any large page. Example:

• https://ru.wikipedia.org/wiki/Путин,_Владимир_Владимирович?action=info
• English version: https://ru.wikipedia.org/wiki/Путин,_Владимир_Владимирович?action=info&uselang=en

A list of 342 templates is listed in a very long table cell, same with everything else. I think we should drop the table in that section and put the lists to be multi-column under separate headings for each type of page property, so they can be scanned more easily and quickly, similarly to what is done on https://en.wikipedia.org/wiki/Special:SpecialPages (but preferably with no column count restriction).

<h3>Templates used on a page</h3>
<ul>
…
</ul>
…etc

It should be hopefully relatively easy to implement.

There is also an issue with accessibility of the page because it uses a bunch of table row headers that aren’t marked as such (<td> → <th scope="row">), but that’s harder to fix given that default styling for wikitable class would make the tables look worse. Tables also lack <caption> element in all cases. (I am listing all of this here because filing tasks on Phabricator for every issue is too complicated.)