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It seems that some parts of your theme are not compatible with WPML, which is a shame.
This information comes to me from WPML itself; I suggest you use Google translate to understand the subject I developed there: https://wpml.org/fr/forums/topic/des-chaines-de-caracteres-introuvable-a-traduire/.
The support tells me that you must warn you and offer to join their GoGlobal program to collaborate to make the theme compatible with WPML
Indeed, I don’t want to lose the modifications they made to translate certain places.