#226 — ITranslatable.getTranslation() implementation does not return the self like described by the interface

Versions: 2.2, 2.4, 3.0rc4

The ITranslatable interface says:

    def getTranslation(language='language'):
        """
        Return the object corresponding to a translated version or None.
        If called without arguments it returns the translation in the currently
        selected language, or self.
        """

But I18NBaseObject.getTranslation() does not return self, if it is called with no argument and the prefered translation does not exist, it returns None

If you prefere to change the implementation behaviour, I can provide a unittest and a test.
But that may break existing application (e.g. I call the method without arguments and do something else than using the object itself if the method returns None.