use Notification, not Notifications in UI elements

Author: andrii-i

src/components/notification-picker.tsx

@@ -128,15 +128,15 @@ export function NotificationPicker({
 
   return (
     <Stack size={2}>
-      <InputLabel>{trans.__('Notifications')}</InputLabel>
+      <InputLabel>{trans.__('Notification')}</InputLabel>
       <FormControlLabel
         control={
           <Switch
             checked={enableNotification}
             onChange={enableNotificationChange}
           />
         }
-        label={trans.__('Enable Notifications')}
+        label={trans.__('Enable Notification')}
       />
       <TextField
         label={trans.__('Send To')}