Following some of my previous posts A translation message extractor command and Create your own constraint validator in symfony2 : A Doctrine unique validator, these two handful functionalities are available on Github in the ExtraToolBundle.
Please, fork me ;)
Also, both functionalities have been strongly improved since I have blogged about them.
The Doctrine UniqueValidator, is now much more configurable and have been updated to support the new namespace annotation injection. And, thanks to Matt Agar the trans:udpate command is now much more robust and supports export to xliff and php translation files. He did a very nice job and it was very nice to have another developer to challenge and contribute to my implementation.
You can find the full details of the new tools on the ExtraToolsBundle’s github.