Updated mediawiki/extensions
Project: mediawiki/extensions/PageSchemas  5e249fb349131fca7cda7109d942feb576582845

UI improvements for Generate Pages page

- add select "All" and "None" buttons to Generate Pages page
- specify utf-8 encoding for xmldocument for saving non-English symbols correctly

Change-Id: I123da5f04f9106611b9b75b9aba02f76b0c95dfc