Your articles come from Notion, so translating them is in your hands. But the interface around them — the search placeholder, "All collections", the "Did this answer your question?" prompt, breadcrumbs, footer labels — ships in English by default. Wording overrides let you replace every one of those strings, which effectively localizes the entire site.
Open Settings → Help Centers → your site → Wording. Each interface string is listed with its English default; fill in a translation next to the ones you want to change and save. Anything you leave blank keeps the default.
Changes apply instantly across the site, the search dialog, and the widget. Here's a fully translated interface in action:
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Running one site per language? Overrides are stored per version, so set the German strings on your German version and the French ones on your French version. See How to Set Up Multi-Language/Version Knowledge Bases in Emovart for the full setup.