For checkbox labels with 'label' option present, {beginLabel} and {endLabel} do not get rendered [$25]

[nilsenpaul]

Steps to reproduce the issue

1. Install Builder, use FormGrid
2. Set bsVersion => '4.*', in config/params.php
3. Create a checkbox with a label

   <?= FormGrid::widget([
          'model' => $profile,
          'form' => $form,
          'autoGenerateColumns' => true,
          'rows' => [
            [
                'attributes' => [
                    'gdpr' => [
                        'type' => Form::INPUT_CHECKBOX,
                        'label' => $gdprRegister,
                    ],             
                ],                 
            ],                     
        ]
    ]); 
   ?>

   Expected behavior and actual behavior

   I expect a label to be shown correctly, within a label tag. What I see (see screenshot) is the label's title, without label tags, but with {beginLabel} and {endLabel} in it. Checkboxes without a label option get rendered correctly.

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[nilsenpaul]

Then I thought, just put the content in the model's attributeLabels, but that gets encoded by default by ActiveField.php, and it contains a link. So, I really need this label option.

[kartik-v]

Resolved via updated enhancement commit.