1.  UploadedFile::getInstances($model, 'file'); sees only one file if not set ```'file[]'```

```php
<?= $form->field($model, 'file[]')->fileInput(['multiple' => '']) ?>
```

2. ```$form->errorSummary(..)``` not return all errors of file attribute, but only the last.
So I had to invent.

```php
if ($model->hasErrors()) {
    echo '<pre>';
    print_r($model->getErrors());
    echo '</pre>';
}
```

So it should be?

Fixes #2955: Changed the signature of ActiveQuery constructors and `ActiveRecord::createQuery()` to simplify customizing ActiveQuery classes

fixes #2887

* query-filter:
  added CHANGELOG lines
  added tests for redis
  added proper tests for elasticsearch
  removed unnecessary code duplication
  adjusted tests
  typo
  renamed Query::filter() to Query::filterWhere()
  reverted elasticsearch rename of filter
  Adjusted search model code generated by Gii CRUD generator
  Added support for arbitrary number of parameters for NOT, AND, OR in filter methods of Query
  Gii CRUD generator now uses new addFilter method
  Query::filter() adjustments
  fixes #2002
  Added tests for Query::filter()

Conflicts:
	framework/db/QueryTrait.php

fixes #2957

add @method hasOne|hasMany declaration in yii\db\ActiveRecord. 

fix for https://github.com/yiisoft/yii2/pull/2958

Add Vietnamese into messages.

#2936: New favicon for applications