Localisation updates from https://translatewiki.net.

Change-Id: I8932fb50353599437cfe3138f4cb969fa77ef493
Prevent Google indexing of the CentralNotice div

We're doing this here because it takes too long to roll out a skin change.

Change-Id: Id6bf279e590409b3464c363ee16442f4eb0dc186
Don't insert banner for bots

Change-Id: Id14c4981138c25b79e45f724844db1f15530ef6e