Accessibility: Administration: Remove <strong> tags from labels on plugin/theme editor screens.

If every single label is emphasized with a `<strong>` tag, none of them is really emphasized anymore.

This removes the tags in favor of CSS styling, for consistency with the other labels on the screen.

Props chemiker, audrasjb, mukesh27, paaljoachim, estelaris, ibdz, SergeyBiryukov.
Fixes #52232.
Built from https://develop.svn.wordpress.org/trunk@49958


git-svn-id: http://core.svn.wordpress.org/trunk@49657 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/plugin-editor.php

@@ -216,7 +216,7 @@ $content = esc_textarea( $content );
 </div>
 <div class="alignright">
 	<form action="plugin-editor.php" method="get">
-		<strong><label for="plugin"><?php _e( 'Select plugin to edit:' ); ?> </label></strong>
+		<label for="plugin" id="theme-plugin-editor-selector"><?php _e( 'Select plugin to edit:' ); ?> </label>
 		<select name="plugin" id="plugin">
 		<?php
 		foreach ( $plugins as $plugin_key => $a_plugin ) {