Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: Ia6ac53c01e54eefe6b6f5b7d487cb529c7e83f0c
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"