Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Iae19e06357caea1e4132c649d3f0497859fae5d2
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"