config/messages.yml
en:
errors:
duck?: 'must respond to %{expected}'
model?: 'must be a model (instance of %{expected})'
relation?: 'must be a relation (many instances of %{expected})'
discard_empty: 'alekseiās too dumb error (%{expected},) you won :-P'
default?: 'default value implementation sucks'
class: 'class guard for arrays implementation sucks'