config = proteus_config.get_config()
context = {'language': 'de'}
with config.set_context(context):
    CustomerShipments = Model.get('stock.shipment.out')
    selection = CustomerShipments.fields_get({})['state']['selection']
    print(selection)

# prints:
# [['draft', 'Draft'], ['done', 'Done'], ['cancel', 'Canceled'], ['assigned', 'Assigned'], ['packed', 'Packed'], ['waiting', 'Waiting']]