Filter by message key substring in Special:Translate

OPEN This issue is open, waiting for action by nike

I'm interested in all messages with keys like 'Templatedata-doc-param-type-*'.

While the filter in Special:Translate apparently can only filter by text.

Filtering by message group is not sufficient because it only brings me as far as 'TemplateData-*'.

I tried Special:PrefixIndex, too, but it gives messages for all languages while I'm only interested in one. And it limits the number of results that it gives, too.

This is a nice feature request. We should report this in Phabricator and then Niklas could probably get it done!