Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
SYMPTOM:
When Strategy Web is set to French, Dossier is sometimes translated into Portfolio unexpectedly.
STEPS TO REPRODUCE:
1. set My Page as default Start Page
2. change Web User preferences to French
3. navigate to My Page, notice that in the Recents there's a square saying, in blue, 'Créez un portfolio':

4. click on the Shared Reports widget and, once in the Shared Reports, click on the Create button. Notice the first option in the list is 'Nouveau Dossier':

CAUSE:
Known issue.
ACTION:
Currently this issue is still being reviewed for feasibility by our Technology team and it is not scoped for any upcoming scheduled Strategy release. Strategy will continue to investigate and post updates as soon as they are available.