Bug 184762 BIRT Model - Enhancments to the level defintion
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
* that the order of the styles within the slot is unimportant.
	 * 
	 * @return A handle for working with the styles.
	 */
	public SlotHandle getStyles( )
	{
		return getSlot( IReportDesignModel.STYLE_SLOT );
	}
	/**
	 * Gets a handle to deal with a translation. A translation is identified by
	 * its resourceKey and locale.
	 * 
	 * @param resourceKey
	 *            the resource key
	 * @param locale
	 *            the locale information
	 * 
	 * @return corresponding <code>TranslationHandle</code>. Or return
	 *         <code>null</code> if the translation is not found in the
	 *         design.
	 * 
	 * @see TranslationHandle
	 */
	public TranslationHandle getTranslation( String resourceKey, String locale )
	{
		Translation translation = module.findTranslation( resourceKey, locale );
		if ( translation != null )
			return translation.handle( getModule( ) );
		return null;
	}