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Overview of the issue
When using Divi Supreme Modules, FAQ widget description field is not translatable, only the title can be translated.
Workaround
1- Go to WPML > Settings > Custom XML Configuration tab
2- Paste the following XML code :
<wpml-config>
<shortcodes>
<shortcode>
<tag label="Supreme FAQ Wrapper">dsm_faq</tag>
</shortcode>
<shortcode>
<tag label="Supreme FAQ Item">dsm_faq_child</tag>
<attributes>
<attribute label="FAQ Title">dsm_title</attribute>
<attribute label="FAQ Content" encoding="allow_html_tags">dsm_content</attribute>
</attributes>
</shortcode>
</shortcodes>
</wpml-config>
3- Re-edit the concerned page and retranslate it