Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I78a6c68b72609306f43c2c8c4d0e57c7a084ee83
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"