Remove fallback 'de' gender namespaces

Some languages are fallback to 'de', but have there own namespaces.
There is no feedback, that the german gender namespaces should override
the localized namespaces for gender, so removing it for now.

At least nds has ask for this at
https://de.wikipedia.org/w/index.php?title=Benutzer_Diskussion:Raymond&oldid=133185685#merkw.C3.BCrdiges_Software-Verhalten_auf_nds.wp

Change-Id: Ie666c95b614faeb9ac1cb57d4b5d96294d43c6cf
Merge "Remove fallback 'de' gender namespaces"