ensure PDO instance has been created at this point

docs/guide-pt-BR/structure-widgets.md - translate [skip ci]

Fix typo in polish transiation

docs/guide-ja/tutorial-advanced-app.md - added [ci skip]

this is not available in PHP >5.4.0 anyway.

> This feature has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP
5.4.0.

http://php.net/manual/en/features.safe-mode.php

/docs/inteernals-ja update [ci skip]

yii\web\AssetManager phpdoc typo [skip ci]

fixes #6717

Update guides pt-BR [skip ci]

docs/guide-ja/test-fixtures.md - added [ci skip]

Fix link in tutorial-performance-tuning.md [skip ci]

Changed typeLink() method to createTypeLink()

Error: Calling unknown method: yii\apidoc\templates\online\ApiRenderer::typeLink()

- yii\db\BaseActiveRecord::findByCondition better exception
- yii\db\ActiveRecord::findByCondition better exception

close #6704

Add helper-overview.md in guide-es and add links in helper-overview.md [...

Docs guide ja test [ci skip]

Docs guide ja tool [ci skip]