Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I1f550dc08e14b559fcfa7ee8bea6ba39f6b2b17d
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"