WPML team has just made compatibility testing so much easier. The new WPML Compatibility Test Tool will allow you to identify problems and solve in minutes, instead of hours. The compatibility test or Theme tester tool will automatically generate test translations for all strings, posts and taxonomy in your site. This includes all standard and custom fields.

You can even set the template for this auto-generated translation, making it easy to notice what’s translated and what’s stuck in the default language.