After you have set the Enable multilingual support System Setting to True, users who have the Edit MultiLingual Data privilege can add translations for operational data using Web Desk.
You cannot use this technique for HTML-enabled fields. For those fields, you need to import the translations – for more information, see Adding translations.
If required, you can prevent users from adding translations to specific attributes on the Article object or Configuration Item objects by setting the property Is Localized? to False for that attribute in Object Designer. For more information, see Attributes.
To add a new culture, select it from the list, then click Add.
You can also add translations from console in a similar way.