In the big multilingual sites with many numbers of translatable pages, using 'Special:AggregateGroups' may be caused some problems. See as example [[ https://meta.wikimedia.org/wiki/Special:AggregateGroups | meta:Special:AggregateGroups]]
Main problems/wishes
1. Strongly needs automatic table of content (list of aggregate groups)
2. Needs a list of pages that are in translation, but not part of any group
3. Needs support for the hierarchical nesting of aggregated groups (if this is not supported for translatable pages; if supported - how to realize this?); or another way for organize these groups
Backstage issues:
4. There is no annotation (a brief description of the purpose of the page - as in another special pages, through "`$specialPageName-summary`" message),
5. There is no link to the help (as in another special pages); //currently no appropriate help page, but (ideally) should be separate help page for each special page in use;
Related issues:
6. from side of each translatable page, would like to understand which aggregated groups it belongs to.
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//PS: See also [[ https://meta.wikimedia.org/wiki/User:Kaganer/Translator%27s_feedback | full wishlist from me ]] (mainly in Russian); this list will be transferred into Phabricator gradually.
//