Revert "Roll back all wikis to php-1.21wmf11 due to bug 46397"

Code fixed with revert in 0f4914bb4ff2d13cb124cad94dc5ded663123a18.

This reverts commit 068be67715825ac6da9a97b158458e02abc61fbb.

Change-Id: Ic0df7e0aff4bea9ccb2d8b62cb1757fcef0dfbc8