Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Ibc425d8d80363434a0366f219c3f6e3c4cec89e7
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"