Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I397fad485a6ecc312c72f89248b3b88c3aa26840
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"