Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Id0c98516dbd10a914d0fb86b45990800e0454d21
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"