Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I5a772d1cbbdfa647ffc5e65844fa54633e8ff023
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"