Replace usage of SpecialPage::getTitle with getPageTitle

Was deprecated in 1.23, see Icdcf5d5295ef5e7f08b1d403e0c123f78738fd40

Change-Id: I58ab8338ee44a0cb2c13bef84338f349e43d8fc3
Merge "Replace usage of SpecialPage::getTitle with getPageTitle"