Breakage when importing translations from bzr branch

We hit OOPS-1739RSBR1 with the following traceback on rosettabranches script:

Traceback (most recent call last):
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/lib/lp/services/job/runner.py", line 178, in runJob
    job.run()
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/lib/lp/code/model/branchjob.py", line 944, in run
    approver.approve(entry)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/lib/lp/translations/model/approver.py", line 133, in approve
    name, domain, entry.path, entry.importer)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/lib/lp/translations/model/potemplate.py", line 1148, in new
    self._copyPOFilesFromSharingTemplates(template)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/lib/lp/translations/model/potemplate.py", line 1121, in _copyPOFilesFromSharingTemplates
    product=template.product)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/lib/lp/translations/model/potemplate.py", line 299, in product
    return self.productseries.product
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/references.py", line 157, in __get__
    self._relation.get_local_variables(local))
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/store.py", line 153, in get
    self.flush()
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/store.py", line 489, in flush
    self._flush_one(obj_info)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/store.py", line 526, in _flush_one
    result = self._connection.execute(expr)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/databases/postgres.py", line 243, in execute
    result = Connection.execute(self, Returning(statement), params)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/database.py", line 237, in execute
    raw_cursor = self.raw_execute(statement, params)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/databases/postgres.py", line 259, in raw_execute
    return Connection.raw_execute(self, statement, params)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/database.py", line 321, in raw_execute
    self._check_disconnect(raw_cursor.execute, *args)
  File "/srv/bzrsyncd.launchpad.net/production/launchpad-rev-9766/eggs/storm-0.17_launchpad_1-py2.6-linux-x86_64.egg/storm/database.py", line 366, in _check_disconnect
    return function(*args, **kwargs)
IntegrityError: duplicate key value violates unique constraint "potemplate__productseries__name__key"

(http://launchpadlibrarian.net/57123697/vLYrN4BdvVwbnEkMvTdiMsgV9p3.txt)

It seems to be related to template approval (and could, by extension, be related to template renames).