Fix OverlayFooterLink template

Change-Id: I9682669f0853cfe8d85d44a6969c221709787a40
Example: TalkOverlay, link to Wikipage not working (cssclass does not exist).
Localisation updates from https://translatewiki.net.

Change-Id: I7125c91ffd295d8dc6b47c8272748c7579d8a006
Merge "Localisation updates from https://translatewiki.net."
Merge "Fix OverlayFooterLink template"