Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I1d54a1abf52aab404bd5e0c47865b165082ddccb
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"