Seems I have found the issue;
The plugin was using the textdomain ‘woocommerce-faqs’, but it is installed on ‘woocommerce-plugin-faqs!. Changing all references from ‘woocommerce-faqs’ to ‘woocommerce-plugin-faqs’ worked for me.
To plugin author: if you want me to send the modified code, just let me know. Thanks for your great job!!
