Bug 197228 Need updaet createdBy info when serialize the module
When open module, designer will pass the property map which contains the createdBy info. this info should be retained by moduleHandle and then be updated and written when doing serialization. Note if this info is null, model should not update it during serialization. This could happen for api users or third-party designer. For BIRT designer, it will guarantee this value always not null.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
* Returns the whole collection of translations defined for the report
	 * module.
	 * <p>
	 * 
	 * @return a list containing all the Translations.
	 */
	public List getTranslations( )
	{
		return translations.getTranslations( );
	}
	/**
	 * Returns the collection of translations defined for a specific message.
	 * The message is presented by its resourceKey.
	 * <p>
	 * 
	 * @param resourceKey
	 *            resource key for the message.
	 * @return a list containing all the Translations defined for the message.
	 */
	public List getTranslations( String resourceKey )
	{
		return translations.getTranslations( resourceKey );
	}
	/**
	 * Returns a string array containing all the resource keys defined for
	 * messages.
	 * <p>
	 * 
	 * @return a string array containing all the resource keys defined for
	 *         messages return null if there is no messages stored.