Additional functions for WordPress Plugin [404 Error Logger] https://wordpress.org/plugins/404-error-logger (for functions.php)

Changes in WordPress Plugin 404 Error Logger.php

<?php
/**
 * Additional functions for WordPress Plugin [404 Error Logger]
 * @link //wordpress.org/plugins/404-error-logger
 */

/**
 * Add WordPress Dashboard Widget only for admin users (can 'manage_options')
 * @link //codex.wordpress.org/Dashboard_Widgets_API
 */
function my_remove_dashboard_widget() {
	remove_meta_box('404_error_log_widget', 'dashboard', 'side');
}
if ( !current_user_can( 'manage_options' ) ) {
	add_action('wp_dashboard_setup', 'my_remove_dashboard_widget');
}

/**
 * Add New Button in Admin Bar only for admin users (can 'manage_options')
 * @link //codex.wordpress.org/Function_Reference/add_node
 */ 
function toolbar_link_404( $wp_admin_bar ) {
	$args = array(
		'id'    => 'my_page_404',
		'title' => '404',
		'href'  =>  get_admin_url() . 'tools.php?page=404_error_log',
		'meta'  => array( 'class' => 'my-toolbar-404' )    );
	$wp_admin_bar->add_node( $args );
}
if ( current_user_can( 'manage_options' ) ) {
	add_action( 'admin_bar_menu', 'toolbar_link_404', 999 );
}

/**
 * Add Styles for Plugin Tables <table>:
 * Different background colors for errors: today, yesterday, day before yesterday
 * Fix Table in Dashboard Widget for Long Error Names
 */
function add_admin_custom_jquery() {
	echo '<script type="text/javascript">
		jQuery(function($){
			$(document).ready(function(){
				var date = new Date();
				var values_now =	[ date.getDate(), 	date.getMonth() + 1 ];
				var values_yesterday =	[ date.getDate() - 1, 	date.getMonth() + 1 ];
				var values_day_before =	[ date.getDate() - 2, 	date.getMonth() + 1 ];
		
				for( var id in values_now ){
					values_now[ id ] = values_now[ id ].toString().replace( /^([0-9])$/, \'0$1\' );
				}
				for( var id in values_yesterday ){
					values_yesterday[ id ] = values_yesterday[ id ].toString().replace( /^([0-9])$/, \'0$1\' );
				}
				for( var id in values_day_before ){
					values_day_before[ id ] = values_day_before[ id ].toString().replace( /^([0-9])$/, \'0$1\' );
				}
		
				var now =		date.getFullYear()+\'-\'+values_now[ 1 ]+\'-\'+values_now[ 0 ];
				var yesterday =		date.getFullYear()+\'-\'+values_yesterday[ 1 ]+\'-\'+values_yesterday[ 0 ];
				var day_before =	date.getFullYear()+\'-\'+values_day_before[ 1 ]+\'-\'+values_day_before[ 0 ];
				
				$(".tools_page_404_error_log .column-date:contains("+ now +")").parent("tr").css({"background-color":"#eafeef"});
				$(".tools_page_404_error_log .column-date:contains("+ yesterday +")").parent("tr").css({"background-color":"#feefea"});
				$(".tools_page_404_error_log .column-date:contains("+ day_before +")").parent("tr").css({"background-color":"#feeaf9"});
				
				$("#404_error_log_widget td:contains("+ now +")").parent("tr").css({"background-color":"#eafeef"});
				$("#404_error_log_widget td:contains("+ yesterday +")").parent("tr").css({"background-color":"#feefea"});
				$("#404_error_log_widget td:contains("+ day_before +")").parent("tr").css({"background-color":"#feeaf9"});
				$("#404_error_log_widget td a").css({"word-break":"break-all"});
				$("#404_error_log_widget td:nth-child(2):not(:contains(1))").css({"color":"red"});
			});
		});
	</script>';
}
add_action('admin_head', 'add_admin_custom_jquery');