Bug 205876 "Preview","Description" on Chart Sample View are not externalized.
"Preview" and "Description" label on Chart Sample View are not externalized so they are dislayed in English. Please check the attached screen shot for detail. I think its hard coded in ChartExamples.java.
chart/org.eclipse.birt.chart.examples/src/org/eclipse/birt/chart/examples/view/ChartExamples.java
TreeItem iItem = new TreeItem( cItem, SWT.NONE ); 
				iItem.setText( (String) iter2.next( ).toString( ) );
			}
		}
		tree.setRedraw( true );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.swt.events.SelectionListener#widgetDefaultSelected(org.eclipse.swt.events.SelectionEvent)
	 */
	public void widgetDefaultSelected( SelectionEvent e )
	{
		
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt.events.SelectionEvent)
	 */
	public void widgetSelected( SelectionEvent e )
	{
		if ( e.getSource( ) instanceof Tree )
		{
			if ( ( (TreeItem) e.item ).getItemCount( ) != 0 )
			{
				preview.renderModel( null );
				description.setText( icp.getDefaultDescription( ) );
				ChartExamplesView.setActionsEnabled(false);
			}