(CE-1161) Applying MW 1.19.22 security patches

Applying MW 1.19.22 security release patches without the release notes,
non-critical bug fixes and version number increase. The non-critical bug
fixes, version number and release notes will be updated later when also
applying the MW 1.19.21 maintenance release that just has a few bug fixes
(CE-1160).
Merge pull request #5500 from Wikia/release-252-CE-1161

(CE-1161) Applying MW 1.19.22 security patches