Translations can be set for a news post in the start area of Sdui. Write your news post as usual - a detailed description can be found under "How do I write news in the start area?".
In the last step you will find the following page:
To allow translations, click on the button to the right of "Allow translations" and accept the data protection regulations.
As soon as you publish the news, users can have it translated.
Note: Translations are only applicable to texts written in Sdui. For example, if you attach a letter from parents as a PDF, it will NOT be translated.