Localized beanfield validation


im new to Vaadin and have a little problem with localized validation with beanfields. I want to modify the default validation hint. I can add a new language by creating in my source folder a package called org.hibernate.validator and add a properties field called ValidationMessages_pl.properties. If i set the locale to pl everything works fine and the validation message from my properties file will be shown. The problem is if i create a propertie file called ValidationMessages_de.properties, only the default validation hints will be shown and not the customized from my propertie file. How can i change this behaviour?

regards Rick