What do you guys mean with 'text domains'? hidden link
4. Auto-registering strings for translation
Go to the WPML -> String Translation page and scroll down to the Auto register strings for translation section. Click the Edit button and make sure that all text domains are selected. --- ---Excluding any text domains can lead to performance issues as WPML would need to load the .mo files.
Languages: English (English )Portuguese (Brazil) (Português )
Timezone: America/Bahia (GMT-03:00)
Thank you for contacting WPML Support. The text domain is a unique identifier WordPress uses to distinguish between all the loaded translation, every theme/plugin in WordPress should have a unique text domain in order to make it possible the WordPress localization functions to work properly. You can read the full details regarding it at: https://codex.wordpress.org/I18n_for_WordPress_Developers. Please, let me know if it helps, have a nice day.