if value not in self.charset[self._character_set]:
	msg = "'%s' not a valid collation for charset '%s'"
	raise ValueError(msg % (value, self._character_set))

===========
Changed to:
===========

if value not in self.charset[self._character_set]:
	msg = _("%(value)s not a valid collation for charset % (_character_set)s") % 	{'value':value,'_character_set':self._character_set}
	raise ValueError(msg)