Updated mediawiki/extensions
Project: mediawiki/extensions/Mantle  b2c987258e63f7573d4906c8e4efcee0f090d0ff

Support file extensions in ResourceLoaderTemplateModule

Don't append '.html' if the template already has an extension.
Paves the way for Handlebars, etc.

Change-Id: Idb9b36e2be10e7e6374b8df5bde95a2c223003b1