Updated German translation
GladeWidgetAdaptor: Fixed glade_widget_adaptor_object_get_children() for internal widgets.

Internal widgets are defined in Glade in the adaptor class that introduced them.
So in order to get internal widgets that are descendant of another internal widget
we need to walk up the adaptor hierarchy to find where internal widgets are defined.

I included this patch in the stable version because without it glade can not access
GtkDialog internal action_area if compiled with gtk master (version 3.13)
GladePreviewer: Fixed bug previewing templates.

XML text data was not escaped when generating the template XML.
GladePreviewer: ignore signal connections to avoid warnings about missing symbols.
GladePreviewWindow: force infobar to show a close button and make label selectable
[l10n] Update Catalan translation
[l10n] Updated Catalan (Valencian) translation
[l10n] Update Catalan translation
[l10n] Updated Catalan (Valencian) translation
GladeEditorProperty: re grab focus on load_common() if property is construct-only.

If the property is construct-only, then glade_widget_rebuild() will be called
which means the object will be removed from the project/selection and
a new one will be added, which makes the eprop loose its focus.
Rolling 3.18.3