Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Ie6df3eb1c262e198314440c021e0fb3aba7e11f8
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"