/* Change Latest Article text on 404 Page Not Found */
function jnews_change_latest_articles_text_on_404_page_not_found($translated_text, $text, $domain) {
	if ( is_404() ) {
		switch ($translated_text) {
			case 'Latest Articles':
				$translated_text = __('Your Title');
				break;
		}
	}
	return $translated_text;
}
add_filter( 'gettext', 'jnews_change_latest_articles_text_on_404_page_not_found', 20, 3 );