Language code added as ID.
<body id="lang-<?php echo ICL_LANGUAGE_CODE; ?>">
Ouput:
<body id="lang-en">
Resource: https://wpml.org/forums/topic/how-to-add-class-to-body-tag-language/
Language code added as ID.
<body id="lang-<?php echo ICL_LANGUAGE_CODE; ?>">
Ouput:
<body id="lang-en">
Resource: https://wpml.org/forums/topic/how-to-add-class-to-body-tag-language/