Change WordPress POSTS menu name, submenu names, and dashicon in the admin menu and associated labels.

cpt-posts-mods.php

<?php
/**
 * Change the name of the main Posts menu and submenus 
 * and change the dashicon of the main menu item
 */
function chuck_change_post_type_menu() {

	global $menu;
	global $submenu;

	$menu[5][0]                 = 'Content Hub';
	$submenu['edit.php'][5][0]  = 'Content';
	$submenu['edit.php'][10][0] = 'Add Content';
	$submenu['edit.php'][15][0] = 'Content Categories';
	$submenu['edit.php'][16][0] = 'Content Tags';

	foreach ( $menu as $key => $val ) {
		if ( 'Content Hub' == $val[0] ) {
			$menu[$key][6] = 'dashicons-welcome-write-blog';
		}
	}

}
add_action( 'admin_menu', 'chuck_change_post_type_menu' );

/**
 * Change the all the Post type meta labels too
 */
function chuck_change_post_type_labels() {

	global $wp_post_types;

	$postLabels = $wp_post_types['post']->labels;
	$postLabels->name               = 'Content Hub';
	$postLabels->singular_name      = 'Content';
	$postLabels->add_new            = 'Add Content';
	$postLabels->add_new_item       = 'Add Content';
	$postLabels->edit_item          = 'Edit Content';
	$postLabels->new_item           = 'Content';
	$postLabels->view_item          = 'View Content';
	$postLabels->search_items       = 'Search the Content Hub';
	$postLabels->not_found          = 'Nothing found in Content Hub';
	$postLabels->not_found_in_trash = 'No Content found in Trash';

}
add_action( 'init', 'chuck_change_post_type_labels' );


/**
 * For Reference ONLY: to change the posts menu dashicon using
 * admin css instead of running through the array.
 * I don't personally like this method but it does work.
 * dashicon content: "\f119" is dashicons-welcome-write-blog
 */
/*
function chuck_change_post_type_args() {
?>
	<style>
		#adminmenu #menu-posts div.wp-menu-image::before {
			content: "\f119";
		}
	</style>
<?php
}
add_action( 'admin_head', 'chuck_change_post_type_args' );
*/