Administration: Unify search results message on list tables.

This wraps the search string in a `<strong>` tag, which makes easier to parse visually especially when your search string also contains double quotes.

Props Mista-Flo, mapk, sergeybiryukov.
Fixes #37353.

Built from https://develop.svn.wordpress.org/trunk@49284


git-svn-id: http://core.svn.wordpress.org/trunk@49046 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/users.php

@@ -571,7 +571,7 @@ switch ( $wp_list_table->current_action() ) {
 
 if ( strlen( $usersearch ) ) {
 	/* translators: %s: Search query. */
-	printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( $usersearch ) );
+	printf( '<span class="subtitle">' . __( 'Search results for: %s' ) . '</span>', '<strong>' . esc_html( $usersearch ) . '</strong>' );
 }
 ?>