fix: adjust layout setting string (#2423)

frontend/appflowy_flutter/assets/translations/en.json

@@ -417,7 +417,7 @@
     "settings": {
       "showWeekNumbers": "Show week numbers",
       "showWeekends": "Show weekends",
-      "firstDayOfWeek": "First day of week",
+      "firstDayOfWeek": "Start week on",
       "layoutDateField": "Layout calendar by"
     }
   }