I hope this is better:

from gluon import current
from gluon.validators import IS_NOT_EMPTY, IS_IN_DB
class IS_NOT_EMPTY_(IS_NOT_EMPTY):
   def __init__(self):
       super(IS_NOT_EMPTY_, self).__init__(error_message=current.T('this is 
required'))
class IS_IN_DB_(IS_IN_DB):
   def __init__(self, *args, **kwargs):
       super(IS_IN_DB_, self).__init__(*args, error_message=current.T('choose 
one or more', **kwargs))

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