Add ExportBtn to settings

src/components/ExportCalendarBtn/ExportBtn.tsx

@@ -9,12 +9,13 @@ export default function ExportCalendarBtn() {
     const calendarUrl = `${import.meta.env.VITE_API_URL}/api/export/ics/${user?.id}`;
 
     return <Button
+        variant="default"
         onClick={() => {
             window.open(
                 `${APP_CONFIG.newCalendarURL}${calendarUrl}`
             );
         }}
     >
-        Exporter
+        Exporter le calendrier
     </Button>
 }