Hi @popoche,
I’ve taken a look and when you try to save with the String Translation plugin active this error is generated:
<div id="error"><p class="wpdberror"><strong>Erreur de la base de données WordPress :</strong> [Table 'scientaxodwp2.wpsc_icl_string_packages' doesn't exist]<br /><code>SELECT s.ID
FROM wpsc_icl_string_packages s
WHERE s.kind='Page Builder ShortCode Strings' AND s.name='2' AND s.title='Page Builder Page 2' AND s.post_id='2'</code></p></div><div id="error"><p class="wpdberror"><strong>Erreur de la base de données WordPress :</strong> [Table 'scientaxodwp2.wpsc_icl_string_packages' doesn't exist]<br /><code>SELECT s.ID
FROM wpsc_icl_string_packages s
WHERE s.kind='Page Builder ShortCode Strings' AND s.name='2' AND s.title='Page Builder Page 2' AND s.post_id='2'</code></p></div>
It looks like one of the database tables for string translation doesn’t exist. This looks like an issue with WPML itself rather than the builder. Here’s a WPML support thread I found with what appears to be the same issue: https://wpml.org/forums/topic/table-toplove_db-wp_icl_string_packages-doesnt-exist/
You could try what is suggested there, or just reach out to WPML for support. Hopefully this helps.