yiisoft/yii2 — pull request #2960 by rmrevin (2014-04-02 13:09:14+00:00)
Title: ActiveForm error: removed purification attribute brackets

Because of these two lines of code do not appear in the error fields that represent arrays.

Example
```php
$form->field($FormModel, 'name[en]')->textField();
$form->field($FormModel, 'name[de]')->textField();
$form->field($FormModel, 'name[ru]')->textField();
```