This thread is resolved. Here is a description of the problem and solution.
Problem: My site currently need one more indonesian language, but it seems like not translating the woocommerce page, for instance if I select chinese, wpml will automatically translate my account, cart, checkout page to chinese language, but not happen in indonesian. Solution: It seems that the Indonesian translation files for WooCommerce are not automatically loaded when you add this language to your website. In this case, all you have to do is download the PO/MO files from here https://translate.wordpress.org/projects/wp-plugins/woocommerce/dev/id/default/ and copy them to /wp-content/languages/plugins/.
This is the technical support forum for WPML - the multilingual WordPress plugin.