Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Icbfe2f2b11ceee742cecac6da25da6da64ba48c2
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"