Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I02a13d5a5c437bdaf78f8d4d942207747546a3d5
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"