Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Ia63a87decd45d44305ba96da40f14e8a344365a0
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"