The Wikipedia project underwent a [https://en.wikipedia.org/wiki/GNU_Free_Documentation_License licensing update] in 2008/2009 from [https://gnu.org/licenses/fdl.html GFDL] to dual-licensing scheme including the non-compatible [https://creativecommons.org/licenses/by-sa/3.0/ CC-BY-SA].
In 2016, I'm noticing that there are some quirks in the software that I'm still investigating, so I've got notes here. Basically, I want to simply figure out whether there are any issues to implementors / site Administrators. '''When setting up a fresh install of MediaWiki; or upgrading a previous installation; is there anything to do with regard to the licensing templates or interface messages so that [[Special:Upload]] "just works"?''' One oddity that I found was that there were a bunch of "self-published" options available in the licensing dropdown, however they rely on a template named 'self' which was not present in this wiki. It is not a trivial exercise to export/import the that template from mediawiki.org nor wikipedia.com. Because of the complex nature of these licensing templates, it is not possible to "copy" the template text.
Ref:
=== Solution ===
The simplest workaround solution I could come up with on short notice found was to export (using [[mw:Special:Export]]) the category '[[mw:Category:License templates]]' from mediawiki.org . The category includes 30+ templates and modules. Be sure to tick the box that says "Include templates". This will generate an xml file for download. Then, import them that file (using [[Special:Import]]) here on your wiki (as admin user).
Note to self: look at the https://www.mediawiki.org/wiki/Extension:UploadWizard for ways to improve https://www.mediawiki.org/wiki/Extension:Html2Wiki in terms of incorporating license templates into the extension.