Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Iaed4fae9d03c2301691be4bccf0a29b816142660
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"