Fix entity translation regressions

Entity translation code needs to be updated due to changes in the ET code base:

• #1280546: Introduce a language selection widget for every entity introduced the possibility for entity translation handlers to wrap empty stub entities. This can cause the following warning to popup:
  Undefined property: stdClass::$delta in EntityTranslationBeanHandler->getEntityId() (line 25 in [...]\sites\all\modules\bean\includes\translation.handler.bean.inc).
• #1799770: Update id and bundle when setting a wrapped entity removed the $entity_id argument from the default translation handler constructor. The bean translation handler needs to do the same to avoid PHP warnings.