Enable GuidedTour on additional language Wikipedias

Newly enable on Arabic (ar), Bengali (bn) and Norwegian (no).

The others already have GuidedTour enabled automatically since they
have GettingStarted, which requires GuidedTour.  However, enable them
specifically to be explicit that we want GuidedTour enabled here
in its own right.

Change-Id: Ibfc9c3a0b0cd3c299fd7e3d834b65020d23319be