Cannot load non-ascii flow pages via api

This is a temporary fix which we will deploy to 1.24wmf19
to allow the new deployment on hewiki and frwiki to test the
respective pages.

Best guess is the javascript is double encoding the api requests,
a patch for that will be incoming.

Change-Id: Ib9aa3a6ce9b8900d449a7fc15508a11dfbc67b9a
(cherry picked from commit d73c6c1f0564d070e4fb0b060fd66ad4bc45d55e)
(cherry picked from commit 8812fa8bd0ab0c1bcb8590fde16b4586bddc57f4)