Admin Strings Replaced by Translations After Visiting the Customizer

Overview of the issue

If your user’s profile language is different from the site’s default language, visiting the WordPress Customizer causes original strings to be replaced by their translations. This occurs with admin strings registered in WPML > String Translation.

This issue may affect themes that use Customizer options such as Astra Theme.

Workaround

Please, make sure of having a full site backup of your site before proceeding.

• Open …/wp-content/plugins/wpml-string-translation/inc/admin-texts/wpml-admin-texts.class.php file.
• Look for line 214.
• Replace:

  		$isAdmin = is_admin() && ! wpml_is_ajax();
  

• With:

  		$isAdmin = is_admin() && ! wpml_is_ajax() || ( isset($_REQUEST["wp_customize"]) && $_REQUEST["wp_customize"] == "on" ) || ( isset($_POST["screen_id"]) && $_POST["screen_id"] == "customize");