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
else
			{
				setClassName( icp.getClassName( ( (TreeItem) e.item ).getText( ) ) );
				String methodName = icp.getMethodName( className );
				setChartModel( ImportChartModel.getChartModel( className,
						methodName ) );
				preview.renderModel( getChartModel( ) );
				description.setText( icp.getDescription( ( (TreeItem) e.item ).getText( ) ) );
				ChartExamplesView.setActionsEnabled(true);
			}
		}
	}
	private void setChartModel( Chart cm )
	{
		chart = cm;
	}
	public static Chart getChartModel( )
	{
		return chart;
	}
	private void setClassName( String name )
	{
		className = name;
	}
	public static String getClassName( )
	{
		return className;
	}
}