Fix rendering of facelets templates zones after JBoss 5 upgrade

Its seems that upgrade to Facelets 1.1.15 changed a little bit one behaviour: zones to define used to be passed on through any level of templating, but this is not the case anymore.

For instance, the template "/incl/documents_layout_table.xhtml" inserts a zone called "empty_folder_label" for customizing the lmabel to display when there are no documents. The template "/incl/content_view.xhtml" defines it, to customize the default label. The template "/search/search_results_advanced.xhtml" defines it again to customize it.

This is not working anymore, but inserting a zone with the same name in template "/incl/content_view.xhtml" fixes it.