Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I0dd50beff9c63654f28f0dc85cea88eff9714d3d
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"