Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I52d734eb3a30356b67b1fa3b3817b77937013b62
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"