add_filter('display_post_states', 'wpsites_custom_post_states');

function wpsites_custom_post_states($states) {
    global $post;
    if( ('page' == get_post_type($post->ID) )
        && ( '/themes/Lef-en-Liefde/woningoverzicht.php' == get_page_templ‌​ate_slug( $post->ID ) ) ) {

            $states[] = __('Custom state');

    }
}

add_filter('display_post_states', 'wpse240081_custom_post_states');

function wpse240081_custom_post_states( $states, $post ) {

    if ( ( 'page' == get_post_type( $post->ID ) )
        && ( 'woningoverzicht.php' == get_page_templ‌​ate_slug( $post->ID ) ) ) {

            $states[] = __('Custom state');

    }

    return $states;
}

<?php
add_filter( 'display_post_states', 'add_display_post_states', 10, 2 );

/**
 * Add a post display state for special WC pages in the page list table.
 *
 * @param array   $post_states An array of post display states.
 * @param WP_Post $post        The current post object.
 */
function add_display_post_states( $post_states, $post ) {
    if ( wc_get_page_id( 'shop' ) === $post->ID ) {
        $post_states['wc_page_for_shop'] = __( 'Shop Page', 'woocommerce' );
    }

    if ( wc_get_page_id( 'cart' ) === $post->ID ) {
        $post_states['wc_page_for_cart'] = __( 'Cart Page', 'woocommerce' );
    }

    if ( wc_get_page_id( 'checkout' ) === $post->ID ) {
        $post_states['wc_page_for_checkout'] = __( 'Checkout Page', 'woocommerce' );
    }

    if ( wc_get_page_id( 'myaccount' ) === $post->ID ) {
        $post_states['wc_page_for_myaccount'] = __( 'My Account Page', 'woocommerce' );
    }

    if ( wc_get_page_id( 'terms' ) === $post->ID ) {
        $post_states['wc_page_for_terms'] = __( 'Terms and Conditions Page', 'woocommerce' );
    }

    return $post_states;
}