<table class="table" style="table-layout:fixed; word-wrap:break-word;" ...attributes>
  <tbody>
    {{#each @comments as |comment index|}}
      <tr>
        <td data-test-comment={{index}}>
          {{#if comment.user}}
            <span style="float:left">
              <LinkTo @route="user" @model={{comment.user.id}} data-test-user>{{comment.user.name}}</LinkTo>:&nbsp;
            </span>
          {{/if}}

          {{markdown comment.text}}
        </td>
      </tr>
    {{else}}
      <tr>
        <td><em>{{t "no-comments-yet"}}</em></td>
      </tr>
    {{/each}}

    {{#if account.user.id}}
      <tr>
        <td>
          <form {{action (perform this.addCommentTask) on="submit"}} data-test-add-comment>
            <Textarea @value={{this.addCommentText}} class="form-control" @disabled={{this.addCommentTask.isRunning}} data-test-input /><br>
            <input type="submit" value={{t "add-comment"}} class="btn btn-primary" disabled={{this.addCommentTask.isRunning}} data-test-submit>
          </form>
        </td>
      </tr>
    {{/if}}
  </tbody>
</table>
<table class="table" style="table-layout:fixed; word-wrap:break-word;" ...attributes>
  <tbody>
    {{#each @comments as |comment index|}}
      <tr>
        <td data-test-comment={{index}}>
          {{#if comment.user}}
            <span style="float:left">
              <LinkTo @route="user" @model={{comment.user.id}} data-test-user>{{comment.user.name}}</LinkTo>:&nbsp;
            </span>
          {{/if}}

          {{markdown comment.text}}
        </td>
      </tr>
    {{else}}
      <tr>
        <td><em>{{t "no-comments-yet"}}</em></td>
      </tr>
    {{/each}}

    {{#if account.user.id}}
      <tr>
        <td>
          <form {{action (perform this.addCommentTask) on="submit"}} data-test-add-comment>
            <Textarea @value={{this.addCommentText}} class="form-control" @disabled={{this.addCommentTask.isRunning}} data-test-input /><br>
            <button type="submit" class="btn btn-primary" disabled={{this.addCommentTask.isRunning}} data-test-submit>{{t "add-comment"}}</button>
          </form>
        </td>
      </tr>
    {{/if}}
  </tbody>
</table>
Convert submit input to button
CommentsList: Convert submit input to button
