Correct labelling for nets (step 1)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29218 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix midpoint not working in 3D view

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@29219 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e