Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Iaf5cd6f2ca1ca4a4ced4fd7a6277d1afeaf446a5
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"