I loved the Wikipedia collections tool when I first found it.
But that was on my tablet, and I never could figure out how to access them from a desktop environment. Perhaps it was implemented in desktop, but I never looked again or found it.
Perhaps keep this alive? What is the data involved? This is all CC licensed so content could still be hosted from another open source project? What would be involved in transferring the data or maintaining this feature from an external project?
Depending on the scope..would be interested in helping to keep this alive..
PS there could be value in keeping track of which folder names map to what sets of articles...