Accessibility: Text Changes: Use sentence case for the word Error in various error messages, instead of all caps.

Using all caps should be avoided for better readability and because screen readers may pronounce all-caps words as abbreviations.

Props afercia, ryokuhi, sabernhardt, garrett-eclipse.
See #47656, #43037, #42945.

git-svn-id: https://develop.svn.wordpress.org/trunk@47156 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/users.php

@@ -274,7 +274,7 @@ switch ( $wp_list_table->current_action() ) {
 <h1><?php _e( 'Delete Users' ); ?></h1>
 		<?php if ( isset( $_REQUEST['error'] ) ) : ?>
 	<div class="error">
-		<p><strong><?php _e( 'ERROR:' ); ?></strong> <?php _e( 'Please select an option.' ); ?></p>
+		<p><strong><?php _e( 'Error:' ); ?></strong> <?php _e( 'Please select an option.' ); ?></p>
 	</div>
 		<?php endif; ?>