Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I1ec3402fa7aafee0be0d8754f1ba4dd28e8617fa
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"