TinyMCE:

- Use `data-wp-*` for processing and styling of the `more` and `nextpage` placeholders, keep the class names for back-compat. Makes them "immune" to "Clear formatting".
- Translate the titles of the placeholders.
Fixes #28772.

git-svn-id: https://develop.svn.wordpress.org/trunk@29317 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-editor.php

@@ -944,6 +944,7 @@ final class _WP_Editors {
 			'Keyboard Shortcuts' => __( 'Keyboard Shortcuts' ),
 			'Toolbar Toggle' => __( 'Toolbar Toggle' ),
 			'Insert Read More tag' => __( 'Insert Read More tag' ),
+			'Read more...' => __( 'Read more...' ), // Title on the placeholder inside the editor
 			'Distraction Free Writing' => __( 'Distraction Free Writing' ),
 		);