------------------
- added TestSubscribers to test subscribers for IObjectAddedEvent,
IObjectCopiedEvent and IObjectMovedEvent [gborelli]
- Do not raise a KeyError when registering or adding a language
independent translation.
[maurits]
- Take account on the use case where user could do and do changes
on the translations groups and its members. Be sure that it does
not leaves any traces of orphan objects in the storage.
[ramon, sneridagh]
- Added Copy/Paste subscribers [ramon]
- Moved generic AddContent subscribers to check language integrity [ramon]
- Bug solving on ITranslationLocator [ramon]
- Updating language, checking translations integrity [ramon]