In `map_to_canonical_id`, `fr:provence-alpes-cote-d-azur` is not mapped to `en:provence-alpes-cote-d-azur`

[raphael0202]

This is due to the fact we don't check in map_to_canonical_id the existence of a xx: version of the tag.

As reported in openfoodfacts/smooth-app#6552