Fix error displayed in block editor when post type doesn't support revisions.
Fix translations in block editor.
* Fix notice appearing on Widgets Block Editor.
* Update translation text domain to `wp-revisions-control`, conforming to WordPress standards. * Add Polish translation thanks to Maciej Gryniuk (https://github.com/odie2).
Introduces block-editor (Gutenberg) sidebar component for supported post types.
* Add bulk actions to purge excess or all revisions. * Introduce unit tests. * Conform to coding standards.