$.fn.ketchup.messages = {
  'required':     'This field is required.',
  'minlength':    'This field must have a minimal length of $arg1.',
  'maxlength':    'This field must have a maximal length of $arg1.',
  'rangelength':  'This field must have a length between $arg1 and $arg2.',
  'min':          'Must be at least $arg1.',
  'max':          'Can not be greater than $arg1.',
  'range':        'Must be between $arg1 and $arg2.',
  'number':       'Must be a number.',
  'digits':       'Must be digits.',
  'email':        'Must be a valid E-Mail.',
  'url':          'Must be a valid URL.',
  'username':     'Must be a valid username.',
  'match':        'Must match the field above.',
  'date':         'Must be a valid date.',
  'minselect':    'Select at least $arg1 checkboxes.',
  'maxselect':    'Select not more than $arg1 checkboxes.',
  'rangeselect':  'Select between $arg1 and $arg2 checkboxes.',
  'thisOr':       'Only one of these options can be filled - but you must fill one.',
  'fillphone':    'You must enter at least one telephone number.',
  'phoneUK':      'You must enter a valid UK phone number or leave blank.',
  'mobileUK':     'You must enter a valid UK mobile number or leave blank.'
};