Improve performance of NodeDecorator.getLocalizedName()

The getLocalizedName method performs a getNodes("hippo:translation") call which causes the all virtual nodes that are childeren of the node to get populated. The (poc) patch tries to fetch the nodes directly instead of iteration (internally in jackrabbit) over all the nodes.

Note: a similar issue exists in the hst in the bean.standard.HippoFolder.getFolders().