Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Ibf74df9cbad37a827f9939fa6a939e41c0e6121f
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"