fdo#52232 ConfigurationSet wrapper unusable for localized properties

The comphelper::ConfigurationSet wrapper, used by the automatically generated
headers to access the configuration data from C++, is based on
com.sun.star.configuration.ReadOnlyAccess/ReadWriteAcess that provide an all-
locales view of the configuration data, i.e., a localized property is represented as a UNO object implementing various container interfaces (to access the per-locale values) instead of a plain value.

Hence,

  xLeaveAccess->getByName(C2U("Label")) >>= sLeafLabel;

silently changed its meaning, now silently failing to extract a string and
leaving sLeafLabel empty, which in turn causes the labels of extension option
pages to disappear from the "Tools - Options..." dialog.

This partially reverts commit 161c3f17 "Some
more comphelper/configurationhelper clean up."

Change-Id: I584c682ea6a7c8b9444b34f1867cc553ad160802

cui/source/inc/treeopt.hxx

@@ -138,6 +138,7 @@ struct LastPageSaver
 // class OfaTreeOptionsDialog --------------------------------------------
 
 namespace com { namespace sun { namespace star { namespace frame { class XFrame; } } } }
+namespace com { namespace sun { namespace star { namespace container { class XNameAccess; } } } }
 namespace com { namespace sun { namespace star { namespace lang { class XMultiServiceFactory; } } } }
 namespace com { namespace sun { namespace star { namespace awt { class XContainerWindowProvider; } } } }
 
@@ -191,8 +192,12 @@ private:
                                             com::sun::star::lang::XMultiServiceFactory >& xMFac,
                                          const com::sun::star::uno::Reference<
                                             com::sun::star::frame::XFrame >& xFrame );
-    Module*         LoadModule( const rtl::OUString& rModuleIdentifier );
-    void            LoadNodes( Module* pModule,
+    Module*         LoadModule( const rtl::OUString& rModuleIdentifier,
+                                const com::sun::star::uno::Reference<
+                                    com::sun::star::container::XNameAccess >& xRoot );
+    void            LoadNodes( const com::sun::star::uno::Reference<
+                                    com::sun::star::container::XNameAccess >& xRoot,
+                               Module* pModule,
                                const rtl::OUString& rExtensionId,
                                VectorOfNodes& rOutNodeList );
     void            InsertNodes( const VectorOfNodes& rNodeList );