Bug 132914 "Invalid page number" error message is hard coded.
"Invalid page number" error message is hard coded in DocumentProcessor.java. This must be externalized into *.properties file. If there are other hard coded error messages, please also externalize.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
private EngineConfig config = null;
	/**
	 * Image directory for report images and charts.
	 */
	private String imageDirectory = null;
	/**
	 * URL accesses images.
	 */
	private String imageBaseUrl = null;
	/**
	 * Image handler instance.
	 */
	private HTMLServerImageHandler imageHandler = null;
	/**
	 * Web app context path.
	 */
	private String contextPath = null;
	/**
	 * Constructor.
	 * 
	 * @param config
	 */
	public ReportEngineService( ServletConfig servletConfig )
	{
		System.setProperty( "RUN_UNDER_ECLIPSE", "false" ); 
		if ( servletConfig == null )
		{
			return;
		}
		config = new EngineConfig( );