Advanced Custom Fields Multilingual

Problem:
L'utilisateur n'arrivait pas à installer Media Translation en ayant l'erreur Erreur impossible de créer le dossier lors de l'installation de Media Translation
Solution:
Vérifier les permissions des dossiers de WordPress
- https://codex.wordpress.org/fr:Modifier_les_Permissions_sur_les_Fichiers
- https://www.skyminds.net/wordpress-accorder-les-bonnes-permissions-aux-fichiers-et-dossiers-avec-chown-et-chmod/

Problem:
The user was having this notice in the dashboard
"WPML is missing some records in the languages tables and it cannot fully work until this issue is fixed. Please go to the Troubleshooting page and click on "Clear language information and repopulate languages" to fix this problem."

Solution:
It is usually a false positive, remove entry "icl_admin_messages" from wp_options table. If the error is still present, we should investigate further.