Russian guide. Start forms

\yii\i18n\DbMessageSource code style fixes

Excess \yii\base\Model::resolveFields() method removed

Fix .gitignore for `basic` and `advanced` application templates

Fix #3756: Convert values to float for number formatting

Fixed duplicate error message when client validation is enabled. Fixes #3740. [skip ci]

Convert string values to floating point, so that `number_format` method can properly format values.

Application templates tests fixed

refactored logger to support array values out of the box.

* 'master' of https://github.com/makroxyz/yii2:
  Fix PostgreSQL enumValues

fixes #3244

fixes #3245, #3244

This reverts commit ea10ba49.

$column->enumValues is set to array[0 =>''] even if $info['enum_values'] is null.
Gii generates always dropDownList in forms.

Fix #3749: Ensure clickable links for Bootstrap Dropdown

The registerPlugin is not required.