Is there a way to reassign or change the core namespaces of mediawiki? For example, I'm having difficulty linking to a page I want to call "Template" because mediawiki has a namespace already for Template. I'd like to re-assign the mediawiki "template" namespace to something else.
Any thoughts?
Basically, no.
You can change the display names of the namespaces in Special:AllMessages, and you can make aliases for the namespaces with $wgNamespaceAliases, but I don't think you can actually change the underlying names.
For example, to go to the talk page for Stack Overflow on the german wikipedia you can use http://de.wikipedia.org/wiki/Talk:Stack_Overflow or http://de.wikipedia.org/wiki/Diskussion:Stack_Overflow and they both take you to the same place.
BUT: The english wikipedia there is a page called Template and I just tested by making a page called Template on my wiki with no problems. So maybe it isn't the template namespace interfering. When I made a link to Template on my wikipedia userpage with [[Template]] it linked to the article Template, not to the name space.
You can partly change the name, under localsettings.php, add extra namespaces with the code number of template like adding main as 0, main:Main Page will redirect to Main Page