<div class="form-group @if ($errors->has('repeat')) has-error @endif">
    <div class="input-group">
         <span class="input-group-addon"><label for="repeat" class="label label-primary">Powtórzenia</label></span>
                        <input type="text" name="repeat" class="form-control" v-model="repeats.value"
                               placeholder="Ilość powtórzeń">
    </div>
    @if ($errors->has('repeat')) <p class="help-block">{{ $errors->first('repeat') }}</p> @endif
</div>