Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I1780cdfeea024ff5c66c784b95db9522f2d3a9e8
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"