- Add a custom TinyMCE plugin to mark content with `translate="no"`.
- Update WYSIWYG editor to support the "Do not translate" toggle button and menu item.
- Highlight non-translatable content with custom styles in the editor.
- Localize plugin strings for English and Russian.
- Add custom response for 419 (CSRF token expiration) using exception handler.
- Update language files to include localized error messages for expired sessions.
Otherwise phpstorm doesn't understand the paths correctly. He thinks that this is not a complete application, but a package. And when creating a class, the namespace indicates “app” with a small letter, but should be “App”.