improved DocumentManagerTest::testFindTranslationAndUpdate

see https://github.com/doctrine/phpcr-odm/issues/564

now we need to find a fix ..
@dbu my intention was to stay close to the normal events. So as an PostUpdate is fired after the flush (when it is really really done) all Post*Translation Events should do same, or?
On the other hand a translation binding stays a little bit outside the persistence lifecycle, but is really done after flush too.
Will have a look at the names and orders of translation events at the weekend again. Maybe we can make it more clear (in the docs too). Change was done in this version right? BC-Break?