I've reported namespace changes in 2011 but it was in bugzilla and I don't remember the bug number, discussion on wiki is the following link: https://mzn.wikipedia.org/wiki/Project:Proposal_for_change_namespaces but a ZWNJ character in Project_talk is change to space, please fix it.
In 2011 a lot of page with prepending project name were missing after adding the project namespace so please make sure nothing will miss in this fix change.