Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Ia37f1f11e4ff124599ed00bbc5d7454386001a03
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"