Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: If312f606e62d4721218a1239b3ecd4ead2513f02
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"