code: public void populateL10nStrings() {
      AllPropertiesMessageSource allPropertiesMessageSource = new AllPropertiesMessageSource();
      String[] namespaces =
          localizationMessageSources
              .stream()
              .map(PropertiesMessageSource::getNamespace)
              .toArray(String[]::new);
      allPropertiesMessageSource.addMolgenisNamespaces(namespaces);
      localizationPopulator.populateLocalizationStrings(allPropertiesMessageSource);
    }
docs: Populates dataService with localization strings from property files on the classpath.
  
  <p>N.B. If you want to add a namespace with a localization resourcebundle, you need to add a
  PropertiesMessageSource bean to the spring context for that namespace.