Spell checker error in review dialog, glib.GError: enchant error for language: en_US.UTF-8

Binary package hint: software-center

Ubuntu Software Center version 3.1.14

moomex reports the following error when attempting to write a review for Banshee (see comment in bug 709526):

2011-01-30 04:42:58,006 - root - INFO - _review_ready_callback: Banshee Media Player,banshee
Traceback (most recent call last):
  File "/usr/share/software-center/submit_review.py", line 923, in <module>
    version=options.version)
  File "/usr/share/software-center/submit_review.py", line 464, in __init__
    self._add_spellcheck_to_textview(self.textview_review)
  File "/usr/share/software-center/submit_review.py", line 321, in _add_spellcheck_to_textview
    spell = gtkspell.Spell(textview, None)
glib.GError: enchant error for language: en_US.UTF-8
2011-01-30 04:43:36,465 - softwarecenter.backend.scagent - WARNING - error in query_info 'DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.'
2011-01-30 04:43:36,466 - softwarecenter.db.update - WARNING - error: DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
2011-01-30 04:43:36,621 - softwarecenter.app - INFO - software-center-agent finished with status 1