To set a custom label for 'subscriptions'
key and reorder menu items to get it at the beginning, try this instead (this will replace your function):
add_filter( 'woocommerce_account_menu_items', 'rename_my_account_menu_items', 100, 1 );
function rename_my_account_menu_items( $items ) {
$ordered_items = array();
// HERE set your custom label name for 'subscriptions' key in this array
$subscription_item = array( 'subscriptions' => __( 'Langgan', 'woocommerce' ) );
// Remove 'subscriptions' key / label pair from original $items array
unset( $items['subscriptions'] );
// merging arrays
$items = array_merge( $subscription_item, $items );
return $items;
}
This code goes in function.php file of your active child theme (or theme) or also in any plugin file.
Tested and works
To make "Langgan" Bold you should need to add in your styles.css file located in your active theme, the following CSS rule:
li.woocommerce-MyAccount-navigation-link--subscriptions {
font-weight: bold !important;
}
OR
nav.woocommerce-MyAccount-navigation > ul > li:first-child {
font-weight: bold !important;
}