Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Ic6e5216eee5240a30c17694e7cb71d923db2defb
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"