Remove german special page alias for 'Version'

The english alias was also used years in german, because it means the
same, so there is no need for a alias/translation. But translatewiki.net
does not allow aliases, which are the same than the english word. That
means the field on Special:AdvancedTranslate is empty and animated
people to fill it.

Follow up Id1400249 (same release, so removing should not be a problem)

Change-Id: I7a451b5cf1c973b0b04270335ff31f81271f27a2