Work on info page and firststeps

Authored by SPQRobin.


Work on info page and firststeps

IncubatorTest.php: when using the parser function, detect when a main page exists, otherwise always show the "missing wiki" info page
InfoPage: when it is a missing wiki, link to IncubatorFirstSteps to start it, passing the current test wiki in the URL
IncubatorFirstSteps: add the language to suggested languages based on the testwiki URL parameter, and pass the parameter on in those language links andpass the parameter on to the create account link, so it will be automatically set
Also make the links at the end bold

Change-Id: Ic1f734fe5c3bcfab8bdc79bb77e8b1f51c43ebb4