* master: (1112 commits)
  Removed unused "use" statements
  Fixed array syntax
  Removed unused "use" statements
  Перевод runtime-handling-errors.md на русский язык
  Mark tests with problematic DBMS as skipped.
  Fixes #3511: Dropped `yii.allowAction()` and modified `yii.confirm()` in `yii.js` to support callbacks
  Update runtime-url-handling.md
  Update runtime-url-handling.md
  Update runtime-url-handling.md
  Update runtime-url-handling.md
  Update runtime-url-handling.md
  Create runtime-url-handling.md
  Fixed test break.
  Fixes #3410: yii.activeForm.js now supports adding/removing fields dynamically
  Fixes #2914: `ActiveForm::fieldConfig` will be merged recursively with the `$options` parameter in `ActiveForm::field()`
  Fixes #4936 [skip ci]
  Reverted/fixed some incorrect changes.
  missing "." sign
  Fixed formatting, initialized options array
  Fixed phpdoc
  ...

Conflicts:
	framework/CHANGELOG.md
	framework/base/Formatter.php
	framework/i18n/Formatter.php
	tests/unit/framework/base/FormatterTest.php
	tests/unit/framework/i18n/FormatterTest.php

neads cleanup

[ci skip] Перевод runtime-handling-errors.md на русский язык

Fixes #3511: Dropped `yii.allowAction()` and modified `yii.confirm()` in `yii.js` to support callbacks

[ci skip] Russian translation of runtime-url-handling.md

Добавил перевод файла runtime-url-handling.md

Fixes #2914: `ActiveForm::fieldConfig` will be merged recursively with the `$options` parameter in `ActiveForm::field()`

[skip ci] Added more missing serbian translations

Simplified ArrayTrait::fields() default implementation since it works fine w/ just field names as values

[ci skip] pt-BR start-hello

Fixes #2380: `yii\widgets\ActiveForm` will register validation js even if there are not fields inside