Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I993782d3da07083b621e17db3df6ad40eba4db37
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"