Merge stable into master

docs/framework/guides/contributing/testing-environment.md

@@ -54,12 +54,12 @@ In order to start the manual tests server, use the `yarn run manual` task.
 
 The task accepts the following options:
 
-* `--files` – Specifies test files to run. Accepts a package name or a glob. For example `--files=ckeditor5` will only run tests from the CKEditor 5 main package. Read more about the [rules for converting the `--files` option to a glob pattern](https://github.com/ckeditor/ckeditor5-dev/tree/master/packages/ckeditor5-dev-tests#rules-for-converting---files-option-to-glob-pattern).
+* `--files` (alias `-f`) – Specifies test files to run. Accepts a package name or a glob. For example `--files=ckeditor5` will only run tests from the CKEditor 5 main package. Read more about the [rules for converting the `--files` option to a glob pattern](https://github.com/ckeditor/ckeditor5-dev/tree/master/packages/ckeditor5-dev-tests#rules-for-converting---files-option-to-glob-pattern).
 * `--language="pl"` – The main language build in into all test editors, passed to the [CKEditor 5 webpack plugin](https://www.npmjs.com/package/@ckeditor/ckeditor5-dev-webpack-plugin).  Check out the {@link features/ui-language UI language guide} to learn more. When unspecified, `'en'` is passed to the test runner.
-* `--additionalLanguages="ar,pl,..."` – Specifies extra languages passed to the [CKEditor 5 webpack plugin](https://www.npmjs.com/package/@ckeditor/ckeditor5-dev-webpack-plugin). Check out the {@link features/ui-language UI language guide} to learn more.
+* `--additional-languages="ar,pl,..."` – Specifies extra languages passed to the [CKEditor 5 webpack plugin](https://www.npmjs.com/package/@ckeditor/ckeditor5-dev-webpack-plugin). Check out the {@link features/ui-language UI language guide} to learn more.
 * `--debug` (alias `-d`) – Allows specifying custom debug flags. For example, the `--debug engine` option uncomments the `// @if CK_DEBUG_ENGINE //` lines in the code. Note that by default `--debug` is set to `true` even if you did not specify it. This enables the base set of debug logs (`// @if CK_DEBUG //`) which should always be enabled in the testing environment. You can completely turn off the debug mode by setting the `--debug false` option.
 * `--port` – Specifies the port for the server to use. Defaults to `8125`.
-* `--identityFile="/path/to/file.js"` – Path to the file containing the license key(s) for closed–source features.
+* `--identity-file="/path/to/file.js"` (alias `-i`) – Path to the file containing the license key(s) for closed–source features.
 
 It starts the server available at http://localhost:8125.