Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I6d6a213ae6ac7b2641ca02af43989814ddd2ee7c
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"