message: fix ng-disabled
diff: <app-form-button
  class="btn-success"
  - :ng-disabled="!valid"
  + :disabled="!valid"
  :icon="model.status !== FiresidePost.STATUS_ACTIVE ? 'add' : 'edit'"
  >
  <span v-if="model.status !== FiresidePost.STATUS_ACTIVE">
  <button
  class="btn btn-outline"
  v-if="model.status !== FiresidePost.STATUS_ACTIVE"
  - :ng-disabled="!valid"
  + :disabled="!valid"
  @click.prevent="onDraftSubmit()"
  >
  <translate>Save as Draft</translate>
  